Role of chronotype in depression

Table 1 Comparison of chronotype assessment tools

Assessment tool	Advantages	Limitations	Applications
Self-reported questionnaires	Low cost, easy to administer, suitable for large samples	Susceptible to recall bias, subjective interpretation	Epidemiological studies, clinical screening
Core body temperature monitoring	Objective, non-invasive, reflects circadian rhythm directly	Requires continuous monitoring equipment, time-consuming	Circadian rhythm research, clinical trials
Dim light melatonin onset	Gold standard for circadian phase assessment	Requires controlled laboratory environment, labor-intensive	Mechanistic studies, precision medicine
Wrist actigraphy	Provides objective data on sleep-wake cycles and activity rhythms	Data analysis requires specialized software, limited to motor activity	Long-term monitoring in clinical settings, personalized treatment
Sleep diaries	Captures detailed daily sleep-wake patterns	Reliant on participant compliance, potential recording errors	Diagnosis of sleep disorders, behavioral interventions
Genetic markers	Identifies genetic basis of chronotype	Limited to research settings, complex interpretation	Genetic epidemiology, molecular mechanism studies