Case Report
Copyright ©The Author(s) 2023.
World J Neurol. Mar 2, 2023; 9(2): 8-16
Published online Mar 2, 2023. doi: 10.5316/wjn.v9.i2.8
Table 1 Differentiation of schizophrenia and delusional disorder

Schizophrenia
Delusional disorder
Clinical featuresDelusional content: Bizarre; Most common: Persecutory type of delusion associated with prominent hallucinations, negative and cognitive symptoms; Functional ability: Severe dysfunctionDelusional content: More understandable; Most common: Jealous followed by somatic and erotomanic delusion; Comorbid: Depression (21.0%-55.8%); Functional ability: Superior
EpidemiologicalLifetime prevalence: 0.48%-1.00%; Age of onset: Late teens and early adulthood Lifetime prevalence: 0.2%; Age of onset: Middle age and above
Treatment response: Observational registry-based cohort study (Swedish population)Effective dose of haloperidol 12.7 mg/d; Duration: 104 d; Pharmacologic: Clozapine, olanzapine, lai; Adjunct treatment: Antidepressants; Psychotherapy: Cognitive behavioral therapyEffective dose of haloperidol 4.7 mg/d; Duration: 65 d; Pharmacologic: Clozapine, olanzapine, lai; Adjunct treatment: Antidepressants; Psychotherapy: Cognitive behavioral therapy