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Purpose: The purpose of this study was to evaluate the effects of age at onset of the first major depressive episode on the clinical features of individuals with majordepressive disorder (MDD) in a large cohort of Korean depressed patients. Materials and Methods: We recruited 419 MDD patients of age over 18 years from the Clinical Research Center for Depression study in South Korea. At the start of the study, the onset age of the first major depressive episode was self-reportedby the subjects. The subjects were divided into four age-at-onset subgroups:childhood and adolescent onset (ages <18), early adult onset (ages 18‒44), middle adult onset (ages 45‒59), and late onset (ages 60+). Using analysisof covariance (ANCOVA) and ordinal logistic regression analysis with adjustingthe effect of age, the relationships between clinical features and age at onset of MDD were evaluated. Results: There was an apparent, but inconsistent correlationbetween clinical features and age at onset. Earlier onset MDD was significantlyassociated with higher proportion of female gender [adjusted odds ratio (AOR)=0.570, p=0.022], more previous suicide attempts (AOR=0.635, p=0.038), greater number of previous depressive episodes (F=3.475, p=0.016) and higher scores on the brief psychiatric rating scale (F=3.254, p=0.022), its negative symptomsubscale (F=6.082, p<0.0001), and the alcohol use disorder identification test (F=7.061, p<0.0001). Conclusion: Early age at onset may increase the likelihood of distinguishable MDD subtype, and age at onset of the first major depressive episode is a promising clinical indicator for the clinical presentation, course, and outcome of MDD.

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