Ogundele MO. Behavioural and emotional disorders in childhood: A brief overview for paediatricians. World J Clin Pediatr 2018; 7(1): 9-26
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Dr. Michael O Ogundele, MBBS, MRCP, MSc, Consultant Paediatrician, Department of Community Paediatrics, NHS Fife, Glenwood Health Centre, Napier Road, Glenrothes KY6 1HK, United Kingdom. firstname.lastname@example.org
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Author contributions: Ogundele MO conceived the idea, collected and analysed the data and prepared the manuscript.
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Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Dr. Michael O Ogundele, MBBS, MRCP, MSc, Consultant Paediatrician, Department of Community Paediatrics, NHS Fife, Glenwood Health Centre, Napier Road, Glenrothes KY6 1HK, United Kingdom. email@example.com
Telephone: +44-1592-765096 Fax: +44-1592-765096
Received: October 27, 2017 Peer-review started: October 29, 2017 First decision: November 20, 2017 Revised: November 30, 2017 Accepted: December 5, 2017 Article in press: December 5, 2017 Published online: February 8, 2018
Mental health problems in children and adolescents include several types of emotional and behavioural disorders, including disruptive, depression, anxiety and pervasive developmental (autism) disorders, characterized as either internalizing or externalizing problems. Disruptive behavioural problems such as temper tantrums, attention deficit hyperactivity disorder, oppositional, defiant or conduct disorders are the commonest behavioural problems in preschool and school age children. The routine Paediatric clinic or Family Medicine/General Practitioner surgery presents with several desirable characteristics that make them ideal for providing effective mental health services to children and adolescents. DSM-5 and ICD-10 are the universally accepted standard criteria for the classification of mental and behaviour disorders in childhood and adults. The age and gender prevalence estimation of various childhood behavioural disorders are variable and difficult to compare worldwide. A review of relevant published literature was conducted, including published meta-analyses and national guidelines. We searched for articles indexed by Ovid, PubMed, PubMed Medical Central, CINAHL, EMBASE, Database of Abstracts and Reviews, and the Cochrane Database of Systematic reviews and other online sources. The searches were conducted using a combination of search expressions including “childhood”, “behaviour”, “disorders” or “problems”. Childhood behaviour and emotional problems with their related disorders have significant negative impacts on the individual, the family and the society. They are commonly associated with poor academic, occupational, and psychosocial functioning. It is important for all healthcare professionals, especially the Paediatricians to be aware of the range of presentation, prevention and management of the common mental health problems in children and adolescents.
Core tip: Mental health problems in children and young people (CYP) include several types of emotional and behavioural disorders, including disruptive, depression, anxiety and pervasive developmental (autism) disorders, characterized as either “internalizing” or “externalizing”. The routine Paediatric or General Practitioner clinic present with several desirable characteristics that make them ideal for providing effective mental health services to CYP. Childhood mental health disorders have significant negative impacts on the individual, the family and the society. It is particularly important for all Paediatricians to be aware of the range of presentation, prevention and management of the common mental health problems in CYP.
Citation: Ogundele MO. Behavioural and emotional disorders in childhood: A brief overview for paediatricians. World J Clin Pediatr 2018; 7(1): 9-26
Mental health disorders (MHD) are very common in childhood and they include emotional-obsessive-compulsive disorder (OCD), anxiety, depression, disruptive (oppositional defiance disorder (ODD), conduct disorder (CD), attention deficit hyperactive disorder (ADHD) or developmental (speech/language delay, intellectual disability) disorders or pervasive (autistic spectrum) disorders. Emotional and behavioural problems (EBP) or disorders (EBD) can also be classified as either “internalizing” (emotional disorders such as depression and anxiety) or “externalizing” (disruptive behaviours such as ADHD and CD). The terminologies of “problems” and “disorders” are interchangeably used throughout this article.
While low-intensity naughty, defiant and impulsive behaviour from time to time, losing one’s temper, destruction of property, and deceitfulness/stealing in the preschool children are regarded as normal, extremely difficult and challenging behaviours outside the norm for the age and level of development, such as unpredictable, prolonged, and/or destructive tantrums and severe outbursts of temper loss are recognized as behaviour disorders. Community studies have identified that more than 80% of pre-schoolers have mild tantrums sometimes but a smaller proportion, less than 10% will have daily tantrums, regarded as normative misbehaviours at this age[2,3]. Challenging behaviours and emotional difficulties are more likely to be recognized as “problems” rather than “disorders” during the first 2 years of life.
Emotional problems, such as anxiety, depression and post-traumatic stress disorder (PTSD) tend to occur in later childhood. They are often difficult to be recognised early by the parents or other carers as many children have not developed appropriate vocabulary and comprehension to express their emotions intelligibly. Many clinicians and carers also find it difficult to distinguish between developmentally normal emotions (e.g., fears, crying) from the severe and prolonged emotional distresses that should be regarded as disorders. Emotional problems including disordered eating behaviour and low self-image are often associated with chronic medical disorders such as atopic dermatitis, obesity, diabetes and asthma, which lead to poor quality of life[7-9].
Identification and management of mental health problems in primary care settings such as routine Paediatric clinic or Family Medicine/General Practitioner surgery are cost-effective because of their several desirable characteristics that make it acceptable to children and young people (CYP) (e.g., no stigma, in local setting, and familiar providers). Several models to improve the delivery of mental health services in the Paediatric/Primary care settings have been recommended and evaluated recently, including coordination with external specialists, joint consultations, improved Mental Health training and more integrated on-site intervention with specialist collaboration[10,11].
A review of relevant published literature was conducted, including published meta-analyses and national guidelines. We searched for articles indexed by Ovid, PubMed, PubMed Medical Central, CINAHL, the Cochrane Database of Systematic reviews and other online sources. The searches were conducted using a combination of search expressions including “childhood”, “behaviour”, “disorders” or “problems”.
CLINICAL PRESENTATIONS OF CHILDHOOD BEHAVIOURAL AND EMOTIONAL DISORDERS
Various definitions for a wide range of childhood behavioural disorders are being used. The DSM-5 offers the commonest universally accepted standard criteria for the classification of mental and behaviour disorders. The ICD-10 is the alternative classification standard.
Any abnormal pattern of behaviour which is above the expected norm for age and level of development can be described as “challenging behaviour”. It has been defined as: “Culturally abnormal behaviour (s) of such an intensity, frequency or duration that the physical safety of the person or others is likely to be placed in serious jeopardy or behaviour which is likely to seriously limit or deny access to and use of ordinary community facilities”. They can include self-injury, physical or verbal aggression, non-compliance, disruption of the environment, inappropriate vocalizations, and various stereotypies. These behaviours can impede learning, restrict access to normal activities and social opportunities, and require a considerable amount of both manpower and financial resources to manage effectively.
Many instances of challenging behaviour can be interpreted as ineffective coping strategies for a young person, with or without learning disability (LD) or impaired social and communication skills, trying to control what is going on around them. Young people with various disabilities, including LD, Autism, and other acquired neuro-behavioural disorders such as brain damage and post-infectious phenomena, may also use challenging behaviour for specific purposes, for example, for sensory stimulation, gaining attention of carers, avoiding demands or to express their limited communication skills. People who have a diverse range of neurodevelopmental disorders are more likely to develop challenging behaviours.
Some environmental factors have been identified which are likely to increase the risk of challenging behaviour, including places offering limited opportunities for making choices, social interaction or meaningful occupation. Other adverse environments are characterized by limited sensory input or excessive noise, unresponsive or unpredictable carers, predisposition to neglect and abuse, and where physical health needs and pain are not promptly identified. For example, the rates of challenging behaviour in teenagers and people in their early 20s is 30%-40% in hospital settings, compared to 5% to 15% among children attending schools for those with severe LD.
Aggression is a common, yet complex, challenging behaviour, and a frequent indication for referral to child and adolescent Psychiatrists. It commonly begins in childhood, with more than 58% of preschool children demonstrating some aggressive behaviour. Aggression has been linked to several risk factors, including individual temperaments; the effects of disturbed family dynamics; poor parenting practices; exposure to violence and the influence of attachment disorders. No single factor is sufficient to explain the development of aggressive behaviour. Aggression is commonly diagnosed in association with other mental health problems including ADHD, CD, ODD, depression, head injury, mental retardation, autism, bipolar disorder, PTSD, or dyslexia.
Disruptive behaviour problems
Disruptive behaviour problems (DBP) include attention deficit hyperactivity disorder (ADHD), oppositional defiant disorder (ODD) and conduct disorder (CD). They constitute the commonest EBPs among CYP. Recent evidence suggests that DBPs should be regarded as a multidimensional phenotype rather than comprising distinct subgroups.
ADHD is the commonest neuro-behavioural disorder in children and adolescents, with prevalence ranging between 5% and 12% in the developed countries. ADHD is characterized by levels of hyperactivity, impulsivity and inattention that are disproportionately excessive for the child’s age and development. The ICD-10 does not use the term “ADHD” but “hyperkinetic disorder”, which is equivalent to severe ADHD. DSM-5 distinguishes between three subtypes of the disorder: predominantly hyperactive/impulsive, predominantly inattentive and combined types (Table 1).
Table 1 Subtypes of attention deficit hyperactivity disorder (based on DSM-5).
Predominantly inattentive (ADD)
Predominantly hyperactivity/ impulsivity
6 of 9 inattentive symptoms
6 of 9 hyperactivity/ impulsivity symptoms
Both criteria for (1) and (2)
Fails to pay close attention to details or makes careless mistakes
Squirms and fidgets
Has difficulty sustaining attention
Can’t stay seated
Does not appear to listen
Struggles to follow through on instructions
Can’t play/work quietly
Has difficulty with organization
“On the go”/“driven by a motor”
Avoids or dislikes tasks requiring a lot of thinking
Blurts out answers
Is unable to wait for his turn
Is easily distracted
Onset before age of 12, lasting more than 6 mo, symptoms pervasive in 2 or more settings, causing significant impairment of daily functioning o development
ADHD: Attention deficit hyperactivity disorder.
CD refers to severe behaviour problems (Table 2), characterized by repetitive and persistent manifestations of serious aggressive or non-aggressive behaviours against people, animals or property such as being defiant, belligerent, destructive, threatening, physically cruel, deceitful, disobedient or dishonest, excessive fighting or bullying, fire-setting, stealing, repeated lying, intentional injury, forced sexual activity and frequent school truancy[13,22]. Children with CD often have trouble understanding how other people think, sometimes described as being callous-unemotional. They may falsely misinterpret the intentions of other people as being mean. They may have immature language skills, lack the appropriate social skills to establish and maintain friendships, which aggravates their feelings of sadness, frustration and anger.
Table 2 DSM-5 definition of conduct disorder and oppositional defiant disorder.
Oppositional defiant disorder
A pattern of angry/irritable mood, argumentative/defiant behavior, or vindictiveness lasting at least 6 mo as evidenced by at least four out of 8 symptoms from any of the following categories, and exhibited during interaction with at least one individual who is not a sibling
A repetitive and persistent pattern of behavior in which the basic rights of others or major age-appropriate societal norms or rules are violated, as manifested by the presence of at least three of the following 15 criteria in the past 12 mo from any of the categories below, with at least one criterion present in the past 6 mo
Aggression to people and animals: (1) Often bullies, threatens, or intimidates others; (2) Often initiates physical fights; (3) Has used a weapon that can cause serious physical harm to others (e.g., a bat, brick, broken bottle, knife, gun); (4) Has been physically cruel to people; (5) Has been physically cruel to animals; (6) Has stolen while confronting a victim (e.g., mugging, purse snatching, extortion, armed robbery); (7) Has forced someone into sexual activity
Angry/irritable mood: (1) Often loses temper; (2) Is often touchy or easily annoyed; (3) Is often angry and resentful
Argumentative/defiant behavior: (4) Often argues with authority figures or, for children and adolescents, with adults; (5) Often actively defies or refuses to comply with requests from authority figures or with rules; (6) Often deliberately annoys others; (7) Often blames others for his or her mistakes or misbehavior
Destruction of property: (8) Has deliberately engaged in fire setting with the intention of causing serious damage; (9) Has deliberately destroyed others’ property (other than by fire setting)
Deceitfulness or theft: (10) Has broken into someone else’s house, building, or car; (11) Often lies to obtain goods or favors or to avoid obligations (i.e., “cons” others); (12) Has stolen items of nontrivial value without confronting a victim (e.g., shoplifting, but without breaking and entering; forgery)
Vindictiveness: (8) Has been spiteful or vindictive at least twice within the past 6 mo
Serious violations of rules: (13) Often stays out at night despite parental prohibitions, beginning before age 13 yr; (14) Has run away from home overnight at least twice while living in the parental or parental surrogate home, or once without returning for a lengthy period; (15) Is often truant from school, beginning before age 13 yr
Note: The persistence and frequency of these behaviors should be used to distinguish a behavior that is within normal limits from a behavior that is symptomatic and the behavior should occur at least once per week for at least 6 mo
The disturbance in behavior causes clinically significant impairment in social, academic, or occupational functioning
The disturbance in behavior is associated with distress in the individual or others in his or her immediate social context (e.g., family, peer group, work colleagues), or it impacts negatively on social, educational, occupational, or other important areas of functioning
If the individual is age 18 yr or older, criteria are not met for antisocial personality disorder
Specify whether: Childhood-onset type (prior to age 10 yr); Adolescent-onset type or Unspecified onset
Specify if: With limited prosocial emotions: Lack of remorse or guilt; Callous-lack of empathy; Unconcerned about performance or Shallow or deficient affect
Specify current severity: Mild; Moderate or Severe
The behaviors do not occur exclusively during the course of a psychotic, substance use, depressive, or bipolar disorder. Also, the criteria are not met for disruptive mood dysregulation disorder
It also requires the presence of three symptoms from the list of 15 (above), and duration of at least 6 mo. There are four divisions of conduct disorder: Socialised conduct disorder, unsocialised conduct disorder, conduct disorders confined to the family context and oppositional defiant disorder
Specify current severity: Mild; moderate or severe based on number of settings with symptoms shown
CD is the commonest reason for CYP referral for psychological and psychiatric treatment. Roughly 50% of all CYP with a MHD have a CD. About 30%-75% of children with CD also have ADHD and 50% of them will also meet criteria for at least one other disorder including Mood, Anxiety, PTSD, Substance abuse, ADHD, learning problems, or thought disorders[24,25]. Majority of boys have an onset of CD before the age of 10 years, while girls tend to present mainly between 14 and 16 years of age. Most CYP with CD grow out of this disorder, but a minority become more dissocial or aggressive and develop antisocial personality disorder as adults.
ODD is considered to be the mildest and commonest of the DBPs, with prevalence estimates of 6%-9% for pre-schoolers and boys outnumbering girls by at least two to one. CYP with ODD are typically openly hostile, negativistic, defiant, uncooperative, and irritable. They lose their tempers easily and are mean and spiteful towards others (Table 2). They are mostly defiant towards authority figures, but they may also be hostile to their siblings or peers. This pattern of adversarial behaviour significantly negatively impact on their lives at home, school, and wider society, and seriously impairs all their relationships.
Emotional problems in later childhood include panic disorder, generalized anxiety disorder (GAD), separation anxiety, social phobia, specific phobias, OCD and depression. Mild to moderate anxiety is a normal emotional response to many stressful life situations. Anxiety is regarded as a disorder when it is disproportionately excessive in severity in comparison to the gravity of the triggering circumstances, leading to abnormal disruption of daily routines. Panic disorder is characterized by panic attacks untriggered by external stimuli. GAD is characterized by generalized worry across multiple life domains. Separation anxiety disorder is characterized by fear related to actual or anticipated separation from a caregiver. Social anxiety disorder (also called social phobia), is characterized by fear of social situations where peers may negatively evaluate the person.
Common manifestations of Anxiety disorders include physical symptoms such as increased heart rate, shortness of breath, sweating, trembling, shaking, chest pain, abdominal discomfort and nausea. Other symptoms include worries about things before they happen, constant concerns about family, school, friends, or activities, repetitive, unwanted thoughts (obsessions) or actions (compulsions), fears of embarrassment or making mistakes, low self-esteem and lack of self-confidence.
Depression often occurs in children under stress, experiencing loss, or having attentional, learning, conduct or anxiety disorders and other chronic physical ailments. It also tends to run in families[7-9,31]. Symptoms of depression are diverse and protean, often mimicking other physical and neurodevelopmental problems, including low mood, frequent sadness, tearfulness, crying, decreased interest or pleasure in almost all activities; or inability to enjoy previously favourite activities, hopelessness, persistent boredom; low energy, social isolation, poor communication, low self-esteem and guilt, feelings of worthlessness, extreme sensitivity to rejection or failure, increased irritability, agitation, anger, or hostility, difficulty with relationships, frequent complaints of physical illnesses such as headaches and stomach aches, frequent absences from school or poor performance in school, poor concentration, a major change in eating and/or sleeping patterns, weight loss or gain when not dieting, talk of or efforts to run away from home, thoughts or expressions of suicide or self-destructive behaviour.
Disruptive mood dysregulation disorder (DMDD) is a childhood disorder characterized by a pervasively irritable or angry mood recently added to DSM-5. The symptoms include frequent episodes of severe temper tantrums or aggression (more than three episodes a week) in combination with persistently negative mood between episodes, lasting for more than 12 mo in multiple settings, beginning after 6 years of age but before the child is 10 years old.
Autistic spectrum and pervasive development disorder
The definition of Autism has evolved over the years and has been broadened over time. DSM-IV-TR and the ICD-10 defined the diagnostic category of pervasive developmental disorders (PDD) as the umbrella terminology used for a group of five disorders characterized by pervasive “qualitative abnormalities in reciprocal social interactions and in patterns of communication, and by a restricted, stereotyped, repetitive repertoire of interests and activities” affecting “the individual’s functioning in all situations”. These included autism, asperger syndrome, childhood disintegrative disorder (CDD), pervasive developmental disorder not otherwise specified (PDD-NOS) and Rett syndrome.
Autism and Asperger Syndrome are the most widely recognised and clinically diagnosed among this group of disorders. CDD is a term used to describe children who have had a period of normal development for the first 2-3 years before a relatively acute onset of regression and emergence of autistic symptoms. PDD-NOS was used, particularly in the United States, to describe individuals who have autistic symptoms, but do not meet the full criteria for Autism or Asperger’s Syndrome, denote a milder version of Autism, or to describe atypical autism symptoms emerging after 30 mo of age, and autistic individuals with other co-morbid disorders.
The category of PDD has been removed from DSM-5 and replaced with Autism Spectrum disorders (ASD). ASD (Table 3) is diagnosed primarily from clinical judgment usually by a multidisciplinary team, with minimal support from diagnostic instruments. Most individuals who received diagnosis based on the DSM-IV should still maintain their diagnosis under DSM-5, with some studies confirming that 91% to 100% of children with PDD diagnoses from the DSM-IV retained their diagnosis under the ASD category using the new DSM-5[35,36], while a systematic review has found a slight decrease in the rate of ASD with DSM-5.
Table 3 DSM-5 criteria for autism spectrum disorders.
Persistent deficits in social communication and social interaction across multiple contexts, as manifested by 3 out 3 of the following, currently or by history
Deficits in social-emotional reciprocity, ranging, for example, from abnormal social approach and failure of normal back-and-forth conversation; to reduced sharing of interests, emotions, or affect; to failure to initiate or respond to social interactions
Deficits in nonverbal communicative behaviours used for social interaction, ranging, for example, from poorly integrated verbal and nonverbal communication; to abnormalities in eye contact and body language or deficits in understanding and use of gestures; to a total lack of facial expressions and nonverbal communication
Deficits in developing, maintaining, and understanding relationships, ranging, for example, from difficulties adjusting behavior to suit various social contexts; to difficulties in sharing imaginative play or in making friends; to absence of interest in peers
Restricted, repetitive patterns of behavior, interests, or activities, as manifested by at least two out of 4 of the following, currently or by history
Stereotyped or repetitive motor movements, use of objects, or speech (e.g., simple motor stereotypies, lining up toys or flipping objects, echolalia, idiosyncratic phrases)
Insistence on sameness, inflexible adherence to routines, or ritualized patterns or verbal nonverbal behavior (e.g., extreme distress at small changes, difficulties with transitions, rigid thinking patterns, greeting rituals, need to take same route or eat food every day)
Highly restricted, fixated interests that are abnormal in intensity or focus (e.g., strong attachment to or preoccupation with unusual objects, excessively circumscribed or perseverative interest)
Hyper- or hyporeactivity to sensory input or unusual interests in sensory aspects of the environment (e.g., apparent indifference to pain/temperature, adverse response to specific sounds or textures, excessive smelling or touching of objects, visual fascination with lights or movement)
Symptoms must be present in the early developmental period (but may not become fully manifest until social demands exceed limited capacities, or may be masked by learned strategies in later life)
Symptoms cause clinically significant impairment in social, occupational, or other important areas of current functioning
With or without accompanying intellectual impairment With or without accompanying language impairment
Associated with a known medical or genetic condition or environmental factor
Specify current severity based on social communication impairments and restricted, repetitive patterns of behavior
There are many intervention approaches and strategies, used alone or in combination, for supporting individuals with ASD. These interventions need to individualized and be closely tailored to the level of social and linguistic abilities, cultural background, family resources, learning style and degree of communication skills.
Various communication enhancement strategies have been designed to manage ASD, including augmentative and alternative communication (AAC), Facilitated Communication, computer-based instruction and video-based instruction (Table 4). Several behavioural and psychological interventions (Table 5) have also been used successfully in managing ASD children, including applied behaviour analysis (ABA) and functional communication training (FCT).
Table 4 Summary of common social communication enhancement strategies.
Augmentative and alternative communication
Supplements/replaces natural speech and/or writing with aided [e.g., Picture Exchange Communication System, line drawings, Blissymbols, speech generating devices, and tangible objects] and/or unaided (e.g., manual signs, gestures, and finger spelling) symbols
Table 5 Summary of common behavioural modification strategies for management of childhood emotional and behavioural disorder.
Uses principles of learning theory to bring about meaningful and positive change in behaviour, to help individuals build a variety of skills (e.g., communication, social skills, self-control, and self-monitoring) and help generalize these skills to other situations
A one-to-one instructional approach based on ABA to teach skills in small, incremental steps in a systematic, controlled fashion, documenting stepwise clearly identified antecedent and consequence (e.g., reinforcement in the form of praise or tangible rewards) for desired behaviours
A play-based, child-initiated behavioural treatment, designed to teach language, decrease disruptive behaviours, and increase social, communication and academic skills, building on a child’s initiative and interests
Uses ABA principles with person-centred values to foster skills that replace challenging behaviours with positive reinforcement of appropriate words and actions. PBS can be used to support children and adults with autism and problem behaviours
Uses interventions to help individuals learn to independently regulate, monitor and record their behaviours in a variety of contexts, and reward themselves for using appropriate behaviours. It’s been found effective for ADHD and ASD children
Various strategies can be used to teach children how to recognise the signs of their growing frustration and learn a range of coping skills designed to defuse their anger and aggressive behaviour, teach them alternative ways to express anger, including relaxation techniques and stress management skills
Social (pragmatic) communication disorder (SCD) is a new diagnosis included under Communication Disorders in the Neurodevelopmental Disorders section of the DSM-5. It is characterized by persistent difficulties with using verbal and nonverbal communication for social purposes, which can interfere with interpersonal relationships, academic achievement and occupational performance, in the absence of restricted and repetitive interests and behaviours (Table 6). Some authors consider that CYP with SCD present with similar but less severe restricted and repetitive interests and behaviours (RRIBs) characteristic of children on the autistic spectrum. SCD is thought to occur more frequently in family members of individuals with autism.
Table 6 DSM-5 criteria for social (pragmatic) communication disorder.
Persistent difficulties in the social use of verbal and nonverbal communication as manifested by all of the following
Deficits in using communication for social purposes, such as greeting and sharing information, in a manner that is appropriate for social context
Impairment in the ability to change communication to match context or the needs of the listener, such as speaking differently in a classroom than on a playground, talking differently to a child than to an adult, and avoiding use of overly formal language
Difficulties following rules for conversation and storytelling, such as taking turns in conversation, rephrasing when misunderstood, and knowing how to use verbal and nonverbal signals to regulate interaction
Difficulties understanding what is not explicitly stated (e.g., making inferences) and nonliteral or ambiguous meaning of language (e.g., idioms, humor, metaphors, multiple meanings that depend on the context for interpretation)
The deficits result in functional limitations in effective communication, social participation, social relationships, academic achievement, or occupational performance, individually or in combination
The onset of the symptoms is in the early developmental period (but deficits may not become fully manifest until social communication demands exceed limited capacities)
The symptoms are not attributable to another medical or neurological condition or to low abilities in the domains of word structure and grammar, and are not better explained by autism spectrum disorder, intellectual disability (intellectual developmental disorder), global developmental delay, or another mental disorder
The term “pragmatic” has been used previously to describe the communication skills that are needed in normal social intercourse and the rules that govern routine interpersonal interactions, including ability to pay at least some attention to the other person in a conversation, take turns, not interrupting the other speaker unless there is a very good reason, match language and volume to the situation and the listener, etc. Social and pragmatic deficit are known to also occur in diverse clinical populations, including ADHD, William’s syndrome, CD, closed head injury and spina bifida/hydrocephalus.
Treatment modalities that have been used for supporting children with SCD are similar to those that have been used for several years in children with ASD (Tables 4 and 5). The first randomized controlled trial of social communication interventions designed primarily for children with SCD was reported in 2012. The Social Communication Intervention Project (http://www.psych-sci.manchester.ac.uk/scip/ ) targets development in social understanding and interaction, verbal and non-verbal pragmatic skills and language processing among children with SCD.
Pathological demand avoidance or Newson’s syndrome
Pathological demand avoidance (PDA) or Newson’s Syndrome is increasingly being accepted as part of the autism spectrum. PDA was first used in 2003 for describing some CYP with autistic symptoms who showed some challenging behaviours. It is characterized by exceptional levels of demand avoidance requested by others, due to high anxiety levels when the individuals feel that they are losing control. Avoidance strategies can range from simple refusal, distraction, giving excuses, delaying, arguing, suggesting alternatives and withdrawing into fantasy, to becoming physically incapacitated (with an explanation such as “my legs don’t work”) or selectively mute in many situations. If they feel threatened to comply, they may become verbally or physically aggressive, best described as a “panic attack”, apparently intended to shock. They tend to resort to “socially manipulative” behaviours. The outrageous acts and lack of concern for their behaviour appears to draw parallels with conduct problems (CP) and callous-unemotional traits (CUT), but reward-based techniques, effective with CP and CUT, seem not to work in people with PDA. PDA is currently neither part of the DSM-5 nor the ICD-10.
Though demand avoidance is a common characteristic of CYP with ASD, it becomes pathological when the levels are disproportionately excessive, and normal daily activities and relationships are negatively impaired. Unlike typically autistic children, people with PDA tend to have much better social communication and interaction skills, and are consequently able to use these abilities to their advantage. They often have highly developed social mimicry and role play, sometimes becoming different characters or personas. The people with PDA appear to retain a keen awareness of how to “push people’s buttons”, suggesting a level of social insight when compared to CYP with Autism. On the other hand, children with PDA exhibit higher levels of emotional symptoms compared to those with ASD or CD. They also often experience excessive mood swings and impulsivity. While the prevalence of ASD in boys is more than four times higher compared to that of girls, the risk of developing PDA appears to be the same for both boys and girls.
PREVALENCE OF BEHAVIOURAL AND EMOTIONAL DISORDERS IN CHILDHOOD
Accurate estimation of various childhood EBPs is difficult due to the problems of research methodologies relying on subjective assessments and varying definitions used. According to most studies, between 10% and 20% of CYP are affected annually by MHDs, and the rates are very similar across different racial and ethnic groups after controlling for income, resident status, education, and neighbourhood support. However, poverty and low socioeconomic status are risk factors that appear to increase the rate of MHDs across populations. A 2001 WHO report  indicated the 6-mo prevalence rate for any MHD in CYP, up to age 17 years, to be 20.9%, with disruptive behaviour disorders (DBD) at 10.3%, second only to Anxiety disorders at 13%. About 5% of CYP in the general population suffer from Depression at any given point in time, which is more prevalent among girls (54%)[31,51].
A previous British Child and Adolescent Mental Health (CAMH) survey carried out by the office of National Statistics (ONS) in 1999 and 2004, comprising 7977 interviews from parents, children and teachers, found the prevalence of MHD among CYP (aged 5-16 years) to be 6% for conduct problems, 4% for emotional problems (Depression or Anxiety) and 1.5% for Hyperkinetic disorders. A similar survey in the United States between 2005 and 2011, the National survey of children’s health (NSCH) involving 78042 households, indicated that 4.6% of CYP aged 3-17 years had a history DBD, with prevalence twice as high among boys as among girls (6.2% vs 3.0%), Anxiety (4.7%), Depression (3.9%), and ASD (1.1%). Reported prevalence rates for DMDD range from 0.8% to 3.3% with the highest rate in preschool children.
AETIOLOGY AND RISK FACTORS FOR CHILDREN’S BEHAVIOURAL AND EMOTIONAL DISORDERS
The exact causes of various childhood EBPs are unknown. Several studies have identified various combinations of genetic predisposition and adverse environmental factors that increase the risk of developing any of these disorders. These include perinatal, maternal, family, parenting, socio-economic and personal risk factors. Table 7 summarizes the evidence for various risk factors associated with development of childhood EBPs.
Table 7 Summary of common risk factors for development of childhood emotional and behavioural disorder.
Maternal psychopathology (mental health status)
Low maternal education, one or both parents with depression, antisocial behaviour, smoking, psychological distress, major depression or alcohol problems, an antisocial personality, substance misuse or criminal activities, teenage parental age, marital conflict, disruption or violence, previous abuse as a child and single (unmarried status)
Dysfunctional families where domestic violence, poor parenting skills or substance abuse are a problem, lead to compromised psychological parental functioning, increased parental conflict, greater harsh, physical, and inconsistent discipline, less responsiveness to children’s needs, and less supportive and involved parenting
Personal and community poverty signs including homelessness, low socio-economic status, overcrowding and social isolation, and exposure to toxic air, lead, and/or pesticides or early childhood malnutrition often lead to poor mental health development Chronic stressors associated with poverty such as single-parenthood, life stress, financial worries, and ever-present challenges cumulatively compromise parental psychological functioning, leading to higher levels of distress, anxiety, anger, depressive symptoms and substance use in disadvantaged parents.
There is ample evidence supporting the genetic inheritability of many EBDs in CYP from their parents. From a prospective study of 209 parents along with their 331 biological offsprings, moderate inheritability (r = 0.23, P < 0.001) between parental and offspring CD was found. Anxiety seems to be transmissible from mothers to their preschool children, through both genetic factors and also through behaviour modelling and an anxious style of parenting.
A developmental taxonomy theory has been proposed by Patterson et al to help understand the mechanisms underlying early onset and course of CPs. They described the vicious cycle of non-contingent parental responses to both prosocial and antisocial child behaviour leading to the inadvertent reinforcement of child behaviour problems. Parents’ engagement in “coercive cycles” lead to children learning the functional value of their aversive behaviours (e.g., physical aggression) for escape and avoidance from unwanted interactions, ultimately leading to the use of heightened aversive behaviours from both the child and parents to obtain social goals. This adverse child behavioural training combined with social rejection often lead to deviant peer affiliation and delinquency in adolescence.
NEUROBIOLOGY OF CHILDHOOD BEHAVIOURAL AND EMOTIONAL DISORDERS
Conflicting findings have been reported in the brain structural variations among CYP with EBPs using magnetic resonance imaging (MRI) studies. The most consistently reported structural abnormalities associated with the DBD include reduced grey matter volume (GMV) in the amygdala, frontal cortex, temporal lobes, and the anterior insula, which is involved in part of a network related to empathic concern for others. Reduced GMV along the superior temporal sulcus has also been found, particularly in girls. A decreased overall mean cortical thickness, thinning of the cingulate and prefrontal cortices; and decreased grey matter density in different brain regions have been reported.
Subtle neurobiological changes in different parts of the brain of CYP with EBPs have been reported from many research studies of functional scans. Peculiar brain changes have been found in the hypothalamus, inferior and superior parietal lobes, right amygdala and anterior insula. Functional MRI studies have demonstrated less activation in the temporal cortex in violent adult offenders and in antisocial and psychopathic individuals compared to non-aggressive offenders.
Reduced basal Hypothalamic-Pituitary-Adrenal (HPA) axis activity has been reported in relation to childhood DBDs and exposure to abuse and neglect. It has been hypothesized that high levels of prenatal testosterone exposure appears to be part of the complex aetiology of EBDs, providing possible explanation for the higher prevalence in males for DBDs, by increasing susceptibility to toxic perinatal environments such as exposure to maternal nicotine and alcohol in pregnancy.
COMPLICATIONS OF CHILDHOOD BEHAVIOURAL AND EMOTIONAL DISORDERS
EBDs in childhood, if left untreated, may have negative short-term and long-term effects on an individual’s personal, educational, family and later professional life. CD has been linked to failure to complete schooling, attaining poor school achievement, poor interpersonal relationships, particularly family breakup and divorce, and experience of long-term unemployment. DBPs in parents have been linked to the abuse of their offspring, thereby increasing their risk of developing CD[84,85]. Children presenting with hyperactivity-inattention behaviours are more likely to have a more favourable educational outcome compared with those with aggression or oppositional behaviours[86,87].
A high prevalence of sleep disturbances is associated with various childhood EBPs. Sleep problems in early childhood is associated with increased prevalence of later Anxiety disorders and ODD[88,89].
Several studies have confirmed a strong relationship between early childhood EBPs and poor future long-term physical and mental health outcomes. Chronic irritability in preschool children, CD and ODD in older children each may be predictive of any current and lifetime Anxiety, Depression and DBDs in later childhood, Mania, Schizophrenia, OCD, major depressive disorder and panic disorder[84,90-92]. Individuals on the adolescent-onset CP path often consume more tobacco and illegal drugs and engage more often in risky sexual behaviour, self-harm, and have increased risk of PTSD, than individuals without childhood conduct problems. They also frequently experience parenting difficulties, including over-reactivity, lax and inconsistent discipline, child physical punishment and lower levels of parental warmth and sensitivity[74,84,93,94]. Approximately 40%-50% of CYP with CD are at the risk of developing antisocial personality disorder in adulthood. Other potential complications include adverse mental and physical health outcomes, social justice system involvement including incarceration, substance use and abuse, alcoholism, homelessness, poverty and domestic abuse[95,96].
An analysis of several Scandinavian studies up to the 1980s has shown higher rates of violent death, estimated to be almost five times higher than expected among young people with previous MHD, with common associated predictive factors including behavioural problems, school problems, and co-morbid alcohol or drug abuse and criminality.
ASSESSMENT AND DIAGNOSIS OF CHILDHOOD BEHAVIOURAL AND EMOTIONAL DISORDERS
Assessment through detailed history taking as well as observation of a child’s behaviour are indispensable sources of information required for clinical diagnosis of EBPs. This should include general medical, developmental, family, social, educational and emotional history. Physical and neurological examination should include assessment of vision, hearing, dysmorphic features, neuro-cutaneous stigmata, motor skills and cognitive assessment. Condition-specific and generic observer feedback on screening rating scales and questionnaires can be used to complement direct clinical observations.
There is no single gold-standard diagnostic tool available for the diagnosis of EBDs, which largely depends on the clinical skills of an integrated collaboration of multi-professional experts. Diagnosis relies on interpretation of subjective multi-source feedback from parents or carers, teachers, peers, professional or other observers provided through a number of psychometric questionnaires or screening tools. Significant discrepancies between various respondents are quite common and clinical diagnosis cannot rely on the psychometric tools alone. There is evidence from the literature suggesting that parents have a tendency to over-report symptoms of ODD and CD in children compared to the teachers.
There are several screening tools that are used for assessing the risk of MHD among CYP. The tools help to identify which individuals would require more in-depth clinical interventions. Supplement material shows a list of common Mental Health screening and assessment tools, summarizing their psychometric testing properties, cultural considerations and costs. The commonest behaviour screening tools include the Behavioral and Emotional Screening System (BESS; ages 3-18 years), the Behavior Assessment System for Children-2nd edition, Pediatric Symptom Checklist (PSC), the Ages and Stages Questionnaire-Social Emotional (ASQ-SE, Ages 0 to 5 years) and the Achenbach System of Empirically Based Assessment (ASEBA), for children aged 1.5 years through adulthood.
MANAGEMENT OF BEHAVIOURAL AND EMOTIONAL DISORDERS IN CHILDREN
Identification of appropriate treatment strategies depend on careful assessment of the prevailing symptoms, the family and caregiver’s influences, wider socio-economic environment, the child’s developmental level and physical health. It requires multi-level and multi-disciplinarian approaches that include professionals such as Psychologists, Psychiatrists, Behavioural Analysts, Nurses, Social care staff, Speech and language Therapists, Educational staff, Occupational Therapists, Physiotherapists, Paediatricians and Pharmacists. Use of pharmacotherapy is usually considered only in combination with psychological and other environmental interventions.
Holistic management strategies will include various combinations of several interventions such as child- and family-focused psychological strategies including Cognitive Behavioural Therapy (CBT), behavioural modification and social communication enhancement techniques, parenting skills training and psychopharmacology. These strategies can play significant roles in the management of children with a wide range of emotional, behavioural and social communication disorders. Effective alternative educational procedures also need to be implemented for the school age children and adolescents.
In early childhood, similar parenting strategies have been found useful to manage several apparently dissimilar EBPs (e.g., infant feeding or sleeping problems, preschool tantrums, disruptive and various emotional problems). This may suggest there is a common maintaining mechanism, which is probably related to poor self-regulation skills, involving the ability to control impulses and expressions of emotion.
Several studies have confirmed the effectiveness of various psychological and pharmacologic therapies in the management of childhood EBDs. A meta-analysis of thirty-six controlled trials, involving 3042 children (mean sample age, 4.7 years), evaluating the effect of psychosocial treatments including parenting programmes on early DBPs, demonstrated large and sustained effects (Hedges’g = 0.82), with the largest effects for general externalizing symptoms and problems of oppositionality and non-compliance, and were weakest, relatively speaking, for problems of impulsivity and hyperactivity.
The treatment of CD among CYP with callous-unemotional traits is still at early stages of research. The mainstay of management for CDs includes individual behavioural or cognitive therapy, psychotherapy, family therapy and medications.
Parental skills training
Any challenging behaviour from CYP is likely to elicit persistent negative reactions from many parents, using ineffective controlling strategies and a decrease in positive responses. There is evidence from published research that social-learning and behaviourally based parent training is capable of producing lasting improvement in children with callous-unemotional traits or CD, reducing externalizing problems for children with DBDs, leading to significant parent satisfaction, particularly when delivered early in childhood[84,105-107]. These interventions are typically delivered in a group format, one 2-h session per week for 4-18 wk, by trained leaders, with the focus on improving parenting skills to manage child behaviour, where parents typically learn to identify, define and observe problem behaviours in new ways, as well as learn strategies to prevent and respond to oppositional behaviour[108,109].
Pooled estimates from a review of 37 randomised controlled studies identified a statistically significant improvement on several rating scales among children with CD up to the age of 18 years. A previous meta-analysis of 24 studies confirmed that Parent-Child Interaction Therapy (PCIT) demonstrated significantly larger effect sizes for reducing negative parent behaviours, negative child behaviours, and caregiver reports of child behaviour problems than did most or all forms of Positive Parenting Programme (Triple P). A recent Cochrane review of 13 studies confirmed the efficacy and cost-effectiveness of group-based parenting interventions for alleviating child conduct problems, enhancing parental mental health and parenting skills, at least in the short term.
Differentiated educational strategies
Research has focused on identifying alternative educational strategies that can be used to improve learning opportunities for children presenting with challenging behaviours from various causes. Supportive school strategies for children with EBDs have traditionally focused on classroom management, social skills and anger management, but many researchers have more recently argued that academically-focused interventions may be most effective. Traditional school policies of suspending or expelling children with EBD can be harmful to them. Researchers have developed “step-by-step” guidelines for teachers to guide them in the selection and implementation of evidence-based strategies that have been identified as effective in increasing levels of engagement and achievement by children with EBD, including peer-assisted learning procedures, class-wide peer tutoring, self-management interventions and tiered intervention systems - most notably Response to Intervention (RtI) and Positive Behavioural Interventions and Supports (PBIS)[113,114].
There is increasing evidence to confirm that school-based interventions to address emerging DBPs produce significant reductions in both parent-, self- and teacher-reported internalizing and externalizing symptoms[114,115].
Treatment and Education of Autistic and Related Communication Handicapped Children (TEACCH) is an educational system designed for the management of children with Autism and related communication disorders[116,117]. There is some evidence that TEACCH programmes also lead to some improvements in motor skills and cognitive measures.
Best practice management strategies for children with PDA are known to differ from those with Autism. Specific guidelines for children with PDA have been published by the British institute for Learning Disabilities. Educational support for CYP with PDA relies on highly individualized strategies that allows them to feel in control. They would respond much better to more indirect and negotiative approaches. For example, “I wonder how we might…” is likely to be more effective than “Now let’s get on with your work”.
Child-focused psychological interventions
Cognitive behavioural therapy (CBT) is one of the most widely used non-pharmacologic treatments for individuals with emotional disorders, especially depression, and with individuals with behavioural problems including ASD. CBT integrates a combination of both cognitive and behavioural learning principles to encourage desirable behaviour patterns. Research evidence from several trials provide strong support for the effectiveness of cognitive–behavioural interventions among CYP with Anxiety and Depression. A recent study of child-focused CBT programme introduced at schools has shown that it produces significant improvement in disruptive behaviours among children.
Self-esteem building strategies can help many children with EBDs, who often experience repeated failures at school and in their interactions with others. These children could be encouraged to identify and excel in their particular talents (such as sports) to help build their self-esteem.
Behavioural modification and social communication enhancement strategies
Behavioural interventions and techniques are designed to reduce problem behaviours and teach functional alternative strategies using the basic principles of behaviour change. Most interventions are based on the principles of Applied Behaviour Analysis (ABA) which is grounded on behavioural learning theory. Table 5 summarizes the common behavioural modification strategies for management of childhood EBDs.
Several strategies have been designed to help children acquire important social skills, such as how to have a conversation or play cooperatively with others, using social group settings and other platforms to teach peer interaction skills and promote socially appropriate behaviours and communication. There is ongoing research in the development of social communication treatment approaches. Table 4 summarizes common social communication enhancement strategies.
PSYCHOPHARMACOLOGY OF CHILDHOOD BEHAVIOURAL AND EMOTIONAL DISORDERS
Medications are often prescribed as part of a comprehensive plan for the management of childhood EBDs that includes other therapies. The greatest level of evidence for pharmacotherapy of childhood EBDs is available for their use in the management of childhood and adolescent ADHD. There is less evidence of any efficacy for medications in the management of other DBPs including ODD and CD. Table 8 lists the common classes of medications used in the management of childhood EBD.
Table 8 Major classes of medications used in management of childhood emotional and behavioural disorders.
Watch for worsening of depression and thoughts about suicide, Watch for unusual bruises, bleeding from the gums when brushing teeth, especially if taking other medications, Blood tests and Blood pressure checks may be needed
Do not stop these medications suddenly without slowly reducing (tapering) the dose as directed by the clinician. While taking buspirone, avoid grapefruit juice, Avoid alcohol, Blood tests may be needed prior to the start of treatment and during treatment
Blood tests may be needed before the start of treatment. Avoid alcohol
Modified from “Medications used for behavioral and emotional disorders. A guide for parents, foster parents, families, youth, caregivers, guardians, and social workers.” May 2010. Available Online: URL: http://www.ct.gov/dcf/lib/dcf/ccmu/pdf/cmcu_-_educational_booklet_5-7-2010.pdf . ADHD: Attention deficit hyperactivity disorder; ASD: Autistic spectrum disorder; PTSD: Post traumatic stress disorder; OCD: Obsessive-compulsive disorder.
Psychostimulants (including different formulations of Methylphenidate and Dexamphetamines) remain the primary medication of choice for management of ADHD in CYP for more than 60 years. About 75% to 80% of children with ADHD will benefit from the use of psychostimulants. Non-stimulant therapy with Atomoxetine or alpha 2-adrenergic agonists (Clonidine and Guanfacine) are also effective second-line alternative options. A recent analysis of 16 randomized trials and one meta-analysis, involving 2668 participants with ADHD, showed that both stimulant and non-stimulant medications led to clinically significant reductions in core symptoms with consistently high effect sizes. The psychosocial treatments alone combining behavioural, cognitive behavioural and skills training techniques demonstrated small- to medium-sized improvements for parent-rated ADHD symptoms, co-occurring emotional or behavioural symptoms and interpersonal functioning.
The use of pharmacological treatments for symptoms of ASD is common but challenging, as there are no medications that directly treat the social and language impairments present in individuals with ASD. The medications used most frequently include antipsychotics (e.g., Risperidone) and Selective Serotonin Reuptake Inhibitors (SSRI) to treat mood and repetitive behaviour problems, and stimulants and other medications used to treat ADHD-related symptoms. The evidence base is good for using atypical antipsychotics to treat challenging and repetitive behaviours, but they also have significant side effects[119,135]. Naltrexone is an opioid antagonist that has been shown from a systematic review (involving 155 children from 10 studies) to significantly improve symptoms of self-injury, irritability, restlessness and hyperactivity in autistic children, with minimal side effects and generally good tolerance, although long-term data are lacking.
Medication use in preschool children for control of ASD and ADHD symptoms is still largely controversial. Stimulant medications for treatment of ADHD are not uniformly licensed for pre-schoolers as there is limited available research evidence to confirm efficacy and safety. Moreover, the effectiveness of parenting interventions in this age group are comparable to the effects of using stimulant drugs among the older CYP[137,138].
Research evidence from two systematic reviews and 20 randomized controlled trials has recently documented the efficacy of psychopharmacology in the management of childhood DBP. Psychostimulants have have been shown to have a moderate-to-large effect on oppositional behaviour, conduct problems, and aggression in youths with ADHD, with and without ODD or CD, while Atomoxetine has only a small effect. There is very-low-quality evidence that Clonidine and Guanfacine have a small-to-moderate effect on oppositional behaviour and conduct problems in youths with ADHD.
Other behavioural disorders in children could also be successfully treated by medications. Traditional and the newer atypical antipsychotics can be used for OCD, Depression, aggression and mood instability.
The commonest antidepressants in used in children are the SSRI and Serotonin-Norepinephrine Reuptake Inhibitor (SNRI) medications as they work well and usually have fewer side effects compared to the older Tricyclic Antidepressants. Antidepressants can be used in the management of Major Depression, Anxiety, Seasonal Affective Disorder (SAD), OCD, PTSD and Social Anxiety. They may also be used to treat enuresis and pre-menstrual syndrome.
Childhood EBDs have significant negative impacts on the society, in the form of direct behavioural consequences and costs, and on the individual, in the form of poor academic, occupational and psychosocial functioning and on the family. The costs to society include the trauma, disruption and psychological problems caused to the victims of crime or aggression in homes, schools and communities, together with the financial costs of services to treat the affected individuals, including youth justice services, courts, prison services, social services, foster homes, psychiatric services, accident and emergency services, alcohol and drug misuse services, in addition to unemployment and other required state benefits.
Prevention and management of EBD is not easy and it requires an integrated multidisciplinary effort by healthcare providers at different levels to be involved in the assessment, prevention and management of affected individuals, and also to provide social, economic and psycho-emotional support to the affected families.
There is increasing evidence base for several psychosocial interventions but less so for pharmacological treatment apart from the use of stimulants for ADHD. Preventive measures that have been researched for controlling the risk of childhood emotional and behaviour problems include breastfeeding, avoiding second-hand smoke exposure in non-smoker youths  and intensive parenting interventions.
Manuscript source: Invited manuscript
Specialty type: Pediatrics
Country of origin: United Kingdom
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Parry TS. Assessment of developmental learning and behavioural problems in children and young people.Med J Aust. 2005;183:43-48.
Hong JS, Tillman R, Luby JL. Disruptive behavior in preschool children: distinguishing normal misbehavior from markers of current and later childhood conduct disorder.J Pediatr. 2015;166:723-730.e1.
Wakschlag LS, Choi SW, Carter AS, Hullsiek H, Burns J, McCarthy K, Leibenluft E, Briggs-Gowan MJ. Defining the developmental parameters of temper loss in early childhood: implications for developmental psychopathology.J Child Psychol Psychiatry. 2012;53:1099-1108.
Bagner DM, Rodríguez GM, Blake CA, Linares D, Carter AS. Assessment of behavioral and emotional problems in infancy: a systematic review.Clin Child Fam Psychol Rev. 2012;15:113-128.
El-Radhi AS. Management of common behaviour and mental health problems.Br J Nurs. 2015;24:586, 588-590.
Gardner F, Shaw DS. Behavioral Problems of Infancy and Preschool Children (0–5). Chapter 53 in Rutter’s Child and Adolescent Psychiatry Fifth Edition.
Lu Y, Mak KK, van Bever HP, Ng TP, Mak A, Ho RC. Prevalence of anxiety and depressive symptoms in adolescents with asthma: a meta-analysis and meta-regression.Pediatr Allergy Immunol. 2012;23:707-715.
Chernyshov PV, Ho RC, Monti F, Jirakova A, Velitchko SS, Hercogova J, Neri E. Gender Differences in Self-assessed Health-related Quality of Life in Children with Atopic Dermatitis.J Clin Aesthet Dermatol. 2016;9:19-24.
Quek YH, Tam WWS, Zhang MWB, Ho RCM. Exploring the association between childhood and adolescent obesity and depression: a meta-analysis.Obes Rev. 2017;18:742-754.
Kolko DJ, Perrin E. The integration of behavioral health interventions in children’s health care: services, science, and suggestions.J Clin Child Adolesc Psychol. 2014;43:216-228.
American Psychiatric Association (APA). Diagnostic and Statistical Manual of Mental Disorders 5th Edition. Washington (DC): APA; 2013; Available from: https://tinyurl.com/y82f6kyj.
World Health Organization (WHO). International Statistical Classification of Diseases and Related Health Problems 10th Revision (ICD-10) Geneva Switzerland: World Health Organization, 1990.
Available from: https://tinyurl.com/neayazp.
Emerson E. Challenging Behaviour: Analysis and intervention in people with learning disabilities. 2nd edition.
: Cambridge University Press; 2001;2-4.
National Institute for Health and Clinical Excellence (NICE). Challenging behaviour and learning disabilities: Prevention and interventions for people with learning disabilities whose behaviour challenges. 2015.
Available from: https://www.nice.org.uk/guidance/ng11.
Tremblay RE, Nagin DS, Séguin JR, Zoccolillo M, Zelazo PD, Boivin M, Pérusse D, Japel C. Physical aggression during early childhood: trajectories and predictors.Pediatrics. 2004;114:e43-e50.
Reebye P. Aggression during early years - infancy and preschool.Can Child Adolesc Psychiatr Rev. 2005;14:16-20.
Gurnani T, Ivanov I, Newcorn JH. Pharmacotherapy of Aggression in Child and Adolescent Psychiatric Disorders.J Child Adolesc Psychopharmacol. 2016;26:65-73.
Bolhuis K, Lubke GH, van der Ende J, Bartels M, van Beijsterveldt CEM, Lichtenstein P, Larsson H, Jaddoe VWV, Kushner SA, Verhulst FC. Disentangling Heterogeneity of Childhood Disruptive Behavior Problems Into Dimensions and Subgroups.J Am Acad Child Adolesc Psychiatry. 2017;56:678-686.
Campbell SB, Shaw DS, Gilliom M. Early externalizing behavior problems: toddlers and preschoolers at risk for later maladjustment.Dev Psychopathol. 2000;12:467-488.
Dretzke J, Frew E, Davenport C, Barlow J, Stewart-Brown S, Sandercock J, Bayliss S, Raftery J, Hyde C, Taylor R. The effectiveness and cost-effectiveness of parent training/education programmes for the treatment of conduct disorder, including oppositional defiant disorder, in children.Health Technol Assess. 2005;9:iii, ix-ix, 1-233.
Centers for Disease Control and Prevention (CDC). Perou RH, Bitsko SJ, Blumberg P, Pastor RM, Ghandour JC, Gfoerer SL. Mental Health Surveillance among Children - United States 2005-2011. Morbidity and Mortality Weekly Report (MMWR).
2013;1-35 Available from: https://www.cdc.gov/mmwr/pdf/other/su6202.pdf.
Nock MK, Kazdin AE, Hiripi E, Kessler RC. Lifetime prevalence, correlates, and persistence of oppositional defiant disorder: results from the National Comorbidity Survey Replication.J Child Psychol Psychiatry. 2007;48:703-713.
Bradley MC, Mandell D. Oppositional defiant disorder: a systematic review of evidence of intervention effectiveness.J Exp Criminol. 2005;1:343-365.
Ramsawh HJ, Chavira DA, Stein MB. Burden of anxiety disorders in pediatric medical settings: prevalence, phenomenology, and a research agenda.Arch Pediatr Adolesc Med. 2010;164:965-972.
Stringaris A. Irritability in children and adolescents: a challenge for DSM-5.Eur Child Adolesc Psychiatry. 2011;20:61-66.
American Psychiatric Association (APA). Diagnostic and Statistical Manual of Mental Disorders 4th Edition. Washington (DC): APA; 2000;866.
McPartland J, Volkmar FR. Autism and related disorders.Handb Clin Neurol. 2012;106:407-418.
Huerta M, Bishop SL, Duncan A, Hus V, Lord C. Application of DSM-5 criteria for autism spectrum disorder to three samples of children with DSM-IV diagnoses of pervasive developmental disorders.Am J Psychiatry. 2012;169:1056-1064.
Kim YS, Fombonne E, Koh YJ, Kim SJ, Cheon KA, Leventhal BL. A comparison of DSM-IV pervasive developmental disorder and DSM-5 autism spectrum disorder prevalence in an epidemiologic sample.J Am Acad Child Adolesc Psychiatry. 2014;53:500-508.
Kulage KM, Smaldone AM, Cohn EG. How will DSM-5 affect autism diagnosis? A systematic literature review and meta-analysis.J Autism Dev Disord. 2014;44:1918-1932.
Maggin DM, Johnson AH, Chafouleas SM, Ruberto LM, Berggren M. A systematic evidence review of school-based group contingency interventions for students with challenging behavior.J Sch Psychol. 2012;50:625-654.
Iacono T, Trembath D, Erickson S. The role of augmentative and alternative communication for children with autism: current status and future trends.Neuropsychiatr Dis Treat. 2016;12:2349-2361.
Reisinger LM, Cornish KM, Fombonne E. Diagnostic differentiation of autism spectrum disorders and pragmatic language impairment.J Autism Dev Disord. 2011;41:1694-1704.
Miller M, Young GS, Hutman T, Johnson S, Schwichtenberg AJ, Ozonoff S. Early pragmatic language difficulties in siblings of children with autism: implications for DSM-5 social communication disorder?J Child Psychol Psychiatry. 2015;56:774-781.
Rapin I. Historical data. In Rapin I (Ed). Preschool Children with Inadequate Communication: Developmental Language Disorder, Autism, Low IQ. Clinics in Developmental Medicine. Cambridge University Press, New York; 1996;57-97.
Norbury CF. Practitioner review: Social (pragmatic) communication disorder conceptualization, evidence and clinical implications.J Child Psychol Psychiatry. 2014;55:204-216.
Adams C, Lockton E, Freed J, Gaile J, Earl G, McBean K, Nash M, Green J, Vail A, Law J. The Social Communication Intervention Project: a randomized controlled trial of the effectiveness of speech and language therapy for school-age children who have pragmatic and social communication problems with or without autism spectrum disorder.Int J Lang Commun Disord. 2012;47:233-244.
Newson E, Le Maréchal K, David C. Pathological demand avoidance syndrome: a necessary distinction within the pervasive developmental disorders.Arch Dis Child. 2003;88:595-600.
O’Nions E, Viding E, Greven CU, Ronald A, Happé F. Pathological demand avoidance: exploring the behavioural profile.Autism. 2014;18:538-544.
O’Nions E, Christie P, Gould J, Viding E, Happé F. Development of the ‘Extreme Demand Avoidance Questionnaire’ (EDA-Q): preliminary observations on a trait measure for Pathological Demand Avoidance.J Child Psychol Psychiatry. 2014;55:758-768.
Copeland WE, Angold A, Costello EJ, Egger H. Prevalence, comorbidity, and correlates of DSM-5 proposed disruptive mood dysregulation disorder.Am J Psychiatry. 2013;170:173-179.
Boden JM, Fergusson DM, Horwood LJ. Risk factors for conduct disorder and oppositional/defiant disorder: evidence from a New Zealand birth cohort.J Am Acad Child Adolesc Psychiatry. 2010;49:1125-1133.
Plant DT, Barker ED, Waters CS, Pawlby S, Pariante CM. Intergenerational transmission of maltreatment and psychopathology: the role of antenatal depression.Psychol Med. 2013;43:519-528.
Murray J, Burgess S, Zuccolo L, Hickman M, Gray R, Lewis SJ. Moderate alcohol drinking in pregnancy increases risk for children’s persistent conduct problems: causal effects in a Mendelian randomisation study.J Child Psychol Psychiatry. 2016;57:575-584.
Owens EB, Hinshaw SP. Perinatal problems and psychiatric comorbidity among children with ADHD.J Clin Child Adolesc Psychol. 2013;42:762-768.
Webster-Stratton C, Reid MJ, Hammond M. Treating children with early-onset conduct problems: intervention outcomes for parent, child, and teacher training.J Clin Child Adolesc Psychol. 2004;33:105-124.
Smeekens S, Riksen-Walraven JM, van Bakel HJ. Multiple determinants of externalizing behavior in 5-year-olds: a longitudinal model.J Abnorm Child Psychol. 2007;35:347-361.
Brody GH, Murry VM, Kim S, Brown AC. Longitudinal pathways to competence and psychological adjustment among African American children living in rural single-parent households.Child Dev. 2002;73:1505-1516.
Padrón A, Galán I, García-Esquinas E, Fernández E, Ballbè M, Rodríguez-Artalejo F. Exposure to secondhand smoke in the home and mental health in children: a population-based study.Tob Control. 2016;25:307-312.
McLoyd V. How money matters for children’s socioemotional adjustment: Family processes and parental investment.Carlo G, Crockett L, Caranza M editors. 2011;33-72.
Odgers CL, Caspi A, Russell MA, Sampson RJ, Arseneault L, Moffitt TE. Supportive parenting mediates neighborhood socioeconomic disparities in children’s antisocial behavior from ages 5 to 12.Dev Psychopathol. 2012;24:705-721.
Galler JR, Bryce CP, Waber DP, Hock RS, Harrison R, Eaglesfield GD, Fitzmaurice G. Infant malnutrition predicts conduct problems in adolescents.Nutr Neurosci. 2012;15:186-192.
Conger RD, Donnellan MB. An interactionist perspective on the socioeconomic context of human development.Annu Rev Psychol. 2007;58:175-199.
Taylor SE, Seeman TE. Psychosocial resources and the SES-health relationship.Ann N Y Acad Sci. 1999;896:210-225.
Shaw DS, Hyde LW, Brennan LM. Early predictors of boys’ antisocial trajectories.Dev Psychopathol. 2012;24:871-888.
Waller R, Dishion TJ, Shaw DS, Gardner F, Wilson MN, Hyde LW. Does early childhood callous-unemotional behavior uniquely predict behavior problems or callous-unemotional behavior in late childhood?Dev Psychol. 2016;52:1805-1819.
Shaw DS, Bell RQ, Gilliom M. A truly early starter model of antisocial behavior revisited.Clin Child Fam Psychol Rev. 2000;3:155-172.
Fischer M, Rolf JE, Hasazi JE, Cummings L. Follow-up of a preschool epidemiological sample: cross-age continuities and predictions of later adjustment with internalizing and externalizing dimensions of behavior.Child Dev. 1984;55:137-150.
Mian ND, Wainwright L, Briggs-Gowan MJ, Carter AS. An ecological risk model for early childhood anxiety: the importance of early child symptoms and temperament.J Abnorm Child Psychol. 2011;39:501-512.
Dougherty LR, Smith VC, Bufferd SJ, Stringaris A, Leibenluft E, Carlson GA, Klein DN. Preschool irritability: longitudinal associations with psychiatric disorders at age 6 and parental psychopathology.J Am Acad Child Adolesc Psychiatry. 2013;52:1304-1313.
Szczepaniak D, McHenry MS, Nutakki K, Bauer NS, Downs SM. The prevalence of at-risk development in children 30 to 60 months old presenting with disruptive behaviors.Clin Pediatr (Phila). 2013;52:942-949.
Raudino A, Woodward LJ, Fergusson DM, Horwood LJ. Childhood conduct problems are associated with increased partnership and parenting difficulties in adulthood.J Abnorm Child Psychol. 2012;40:251-263.
Patterson GR, DeBaryshe BD, Ramsey E. A developmental perspective on antisocial behavior.Am Psychol. 1989;44:329-335.
Brennan LM, Shaw DS. Revisiting data related to the age of onset and developmental course of female conduct problems.Clin Child Fam Psychol Rev. 2013;16:35-58.
Michalska KJ, Decety J, Zeffiro TA, Lahey BB. Association of regional gray matter volumes in the brain with disruptive behavior disorders in male and female children.Neuroimage Clin. 2014;7:252-257.
Fahim C, He Y, Yoon U, Chen J, Evans A, Pérusse D. Neuroanatomy of childhood disruptive behavior disorders.Aggress Behav. 2011;37:326-337.
Sebastian CL, McCrory EJ, Cecil CA, Lockwood PL, De Brito SA, Fontaine NM, Viding E. Neural responses to affective and cognitive theory of mind in children with conduct problems and varying levels of callous-unemotional traits.Arch Gen Psychiatry. 2012;69:814-822.
Raine A, Yang Y, Narr KL, Toga AW. Sex differences in orbitofrontal gray as a partial explanation for sex differences in antisocial personality.Mol Psychiatry. 2011;16:227-236.
Kiehl KA, Smith AM, Mendrek A, Forster BB, Hare RD, Liddle PF. Temporal lobe abnormalities in semantic processing by criminal psychopaths as revealed by functional magnetic resonance imaging.Psychiatry Res. 2004;130:27-42.
Kohrt BA, Hruschka DJ, Kohrt HE, Carrion VG, Waldman ID, Worthman CM. Child abuse, disruptive behavior disorders, depression, and salivary cortisol levels among institutionalized and community-residing boys in Mongolia.Asia Pac Psychiatry. 2015;7:7-19.
Martel MM, Roberts BA. Prenatal testosterone increases sensitivity to prenatal stressors in males with disruptive behavior disorders.Neurotoxicol Teratol. 2014;44:11-17.
Smith JD, Dishion TJ, Shaw DS, Wilson MN, Winter CC, Patterson GR. Coercive family process and early-onset conduct problems from age 2 to school entry.Dev Psychopathol. 2014;26:917-932.
Lynch RJ, Kistner JA, Allan NP. Distinguishing among disruptive behaviors to help predict high school graduation: does gender matter?J Sch Psychol. 2014;52:407-418.
Serra-Pinheiro MA, Mattos P, Regalla MA, de Souza I, Paixão C. Inattention, hyperactivity, oppositional-defiant symptoms and school failure.Arq Neuropsiquiatr. 2008;66:828-831.
Spruyt K, Gozal D. Sleep disturbances in children with attention-deficit/hyperactivity disorder.Expert Rev Neurother. 2011;11:565-577.
Shanahan L, Copeland WE, Angold A, Bondy CL, Costello EJ. Sleep problems predict and are predicted by generalized anxiety/depression and oppositional defiant disorder.J Am Acad Child Adolesc Psychiatry. 2014;53:550-558.
Dougherty LR, Smith VC, Bufferd SJ, Kessel E, Carlson GA, Klein DN. Preschool irritability predicts child psychopathology, functional impairment, and service use at age nine.J Child Psychol Psychiatry. 2015;56:999-1007.
Stringaris A, Lewis G, Maughan B. Developmental pathways from childhood conduct problems to early adult depression: findings from the ALSPAC cohort.Br J Psychiatry. 2014;205:17-23.
Luby JL, Gaffrey MS, Tillman R, April LM, Belden AC. Trajectories of preschool disorders to full DSM depression at school age and early adolescence: continuity of preschool depression.Am J Psychiatry. 2014;171:768-776.
Kretschmer T, Hickman M, Doerner R, Emond A, Lewis G, Macleod J, Maughan B, Munafò MR, Heron J. Outcomes of childhood conduct problem trajectories in early adulthood: findings from the ALSPAC study.Eur Child Adolesc Psychiatry. 2014;23:539-549.
van der Molen E, Blokland AA, Hipwell AE, Vermeiren RR, Doreleijers TA, Loeber R. Girls’ childhood trajectories of disruptive behavior predict adjustment problems in early adolescence.J Child Psychol Psychiatry. 2015;56:766-773.
Burke JD, Waldman I, Lahey BB. Predictive validity of childhood oppositional defiant disorder and conduct disorder: implications for the DSM-V.J Abnorm Psychol. 2010;119:739-751.
Fergusson DM, Horwood LJ, Ridder EM. Show me the child at seven: the consequences of conduct problems in childhood for psychosocial functioning in adulthood.J Child Psychol Psychiatry. 2005;46:837-849.
Engqvist U, Rydelius PA. Death and suicide among former child and adolescent psychiatric patients.BMC Psychiatry. 2006;6:51.
Ogundele MO. The Influence of Socio-Economic Status on the Prevalence of School-Age Childhood Behavioral Disorders in a Local District Clinic of North West England.J Fam Med and Health Care. 2016;2:98-107.
Strickland J, Hopkins J, Keenan K. Mother-teacher agreement on preschoolers’ symptoms of ODD and CD: does context matter?J Abnorm Child Psychol. 2012;40:933-943.
Shaw DS, Bell RQ. Developmental theories of parental contributors to antisocial behavior.J Abnorm Child Psychol. 1993;21:493-518.
Comer JS, Chow C, Chan PT, Cooper-Vince C, Wilson LA. Psychosocial treatment efficacy for disruptive behavior problems in very young children: a meta-analytic examination.J Am Acad Child Adolesc Psychiatry. 2013;52:26-36.
Hawes DJ, Price MJ, Dadds MR. Callous-unemotional traits and the treatment of conduct problems in childhood and adolescence: a comprehensive review.Clin Child Fam Psychol Rev. 2014;17:248-267.
Cunningham CE, Boyle MH. Preschoolers at risk for attention-deficit hyperactivity disorder and oppositional defiant disorder: family, parenting, and behavioral correlates.J Abnorm Child Psychol. 2002;30:555-569.
Gardner F, Burton J, Klimes I. Randomised controlled trial of a parenting intervention in the voluntary sector for reducing child conduct problems: outcomes and mechanisms of change.J Child Psychol Psychiatry. 2006;47:1123-1132.
Hutchings J, Gardner F, Bywater T, Daley D, Whitaker C, Jones K, Eames C, Edwards RT. Parenting intervention in Sure Start services for children at risk of developing conduct disorder: pragmatic randomised controlled trial.BMJ. 2007;334:678.
Perrin EC, Sheldrick RC, McMenamy JM, Henson BS, Carter AS. Improving parenting skills for families of young children in pediatric settings: a randomized clinical trial.JAMA Pediatr. 2014;168:16-24.
Shaw DS, Dishion TJ, Supplee L, Gardner F, Arnds K. Randomized trial of a family-centered approach to the prevention of early conduct problems: 2-year effects of the family check-up in early childhood.J Consult Clin Psychol. 2006;74:1-9.
Funderburk BW, Eyberg SM. Parent-Child Interaction Therapy.Norcross JC VandenBos GR Freedheim DK editors. Washington DC: American Psychological Association; 2011;415-420.
Thomas R, Zimmer-Gembeck MJ. Behavioral outcomes of Parent-Child Interaction Therapy and Triple P-Positive Parenting Program: a review and meta-analysis.J Abnorm Child Psychol. 2007;35:475-495.
Furlong M, McGilloway S, Bywater T, Hutchings J, Smith SM, Donnelly M. Cochrane review: behavioural and cognitive-behavioural group-based parenting programmes for early-onset conduct problems in children aged 3 to 12 years (Review).Evid Based Child Health. 2013;8:318-692.
Lane KL. Identifying and Supporting Students at Risk for Emotional and Behavioral Disorders within Multi-level Models: Data Driven Approaches to Conducting Secondary Interventions with an Academic Emphasis.Education & Treatment of Children. 2007;30:135-164.
Farley C, Torres C, Wailehua C-UT, Cook L. Evidence-Based Practices for Students with Emotional and Behavioral Disorders: Improving Academic Achievement.Beyond Behavior. 2012;21:37-43.
Winther J, Carlsson A, Vance A. A pilot study of a school-based prevention and early intervention program to reduce oppositional defiant disorder/conduct disorder.Early Interv Psychiatry. 2014;8:181-189.
Horner RG, Sugai G, Vincent C. School-wide Positive Behavior Support: Investing in Student Success.Impact. 2005;18:4.
Ollendick TH, King NJ. Empirically supported treatments for children with phobic and anxiety disorders: current status.J Clin Child Psychol. 1998;27:156-167.
Liber JM, De Boo GM, Huizenga H, Prins PJ. School-based intervention for childhood disruptive behavior in disadvantaged settings: a randomized controlled trial with and without active teacher support.J Consult Clin Psychol. 2013;81:975-987.
Reichow B, Volkmar FR. Social skills interventions for individuals with autism: evaluation for evidence-based practices within a best evidence synthesis framework.J Autism Dev Disord. 2010;40:149-166.
Carr EG, Durand VM. Reducing behavior problems through functional communication training.J Appl Behav Anal. 1985;18:111-126.
Carr EG, Dunlap G, Horner RH, Koegel RL, Turnbull AP, Sailor W, Fox L. Positive behavior support: evolution of an applied science.J Pos Beh Interv. 2002;4:4-16.
Reid R, Trout AL, Schartz M. Self-Regulation Interventions for Children with Attention Hyperactivity Disorder.Exceptional Children. 2005;71:361-377.
Schepis MM, Reid DH, Ownbey J, Parsons MB. Training support staff to embed teaching within natural routines of young children with disabilities in an inclusive preschool.J Appl Behav Anal. 2001;34:313-327.
Drager K, Light J, McNaughton D. Effects of AAC interventions on communication and language for young children with complex communication needs.J Pediatr Rehabil Med. 2010;3:303-310.
Mirenda P. Supporting individuals with challenging behavior through functional communication training and AAC: Research review.Augment Altern Commun. 1997;13:207-225.
Hart JE, Whalon KJ. Promote academic engagement and communication of students with autism spectrum disorder in inclusive settings.ISC. 2008;44:116-120.
Briars L, Todd T. A Review of Pharmacological Management of Attention-Deficit/Hyperactivity Disorder.J Pediatr Pharmacol Ther. 2016;21:192-206.
Chan E, Fogler JM, Hammerness PG. Treatment of Attention-Deficit/Hyperactivity Disorder in Adolescents: A Systematic Review.JAMA. 2016;315:1997-2008.
McPheeters ML, Warren Z, Sathe N, Bruzek JL, Krishnaswami S, Jerome RN, Veenstra-Vanderweele J. A systematic review of medical treatments for children with autism spectrum disorders.Pediatrics. 2011;127:e1312-e1321.
Roy A, Roy M, Deb S, Unwin G, Roy A. Are opioid antagonists effective in attenuating the core symptoms of autism spectrum conditions in children: a systematic review.J Intellect Disabil Res. 2015;59:293-306.
Sonuga-Barke EJ, Daley D, Thompson M, Laver-Bradbury C, Weeks A. Parent-based therapies for preschool attention-deficit/hyperactivity disorder: a randomized, controlled trial with a community sample.J Am Acad Child Adolesc Psychiatry. 2001;40:402-408.
Doyle CA, McDougle CJ. Pharmacologic treatments for the behavioral symptoms associated with autism spectrum disorders across the lifespan.Dialogues Clin Neurosci. 2012;14:263-279.
Pringsheim T, Hirsch L, Gardner D, Gorman DA. The pharmacological management of oppositional behaviour, conduct problems, and aggression in children and adolescents with attention-deficit hyperactivity disorder, oppositional defiant disorder, and conduct disorder: a systematic review and meta-analysis. Part 1: psychostimulants, alpha-2 agonists, and atomoxetine.Can J Psychiatry. 2015;60:42-51.
Kodish I, Rockhill C, Varley C. Pharmacotherapy for anxiety disorders in children and adolescents.Dialogues Clin Neurosci. 2011;13:439-452.
Gledhill J, Hodes M. Management of depression in children and adolescents.Prog Neurol Psychiatry. 2015;19:28-33.
Shelton KH, Collishaw S, Rice FJ, Harold GT, Thapar A. Using a genetically informative design to examine the relationship between breastfeeding and childhood conduct problems.Eur Child Adolesc Psychiatry. 2011;20:571-579.
Bandiera FC, Richardson AK, Lee DJ, He JP, Merikangas KR. Secondhand smoke exposure and mental health among children and adolescents.Arch Pediatr Adolesc Med. 2011;165:332-338.