This study examined differences in clinical presentation and functional impairment in youth with obsessive-compulsive disorder (OCD) with or without comorbid depressive disorders and sought to determine the predictors of youth-reported depressive symptoms. One-hundred and sixty youth were reliably diagnosed with OCD and comorbid disorders using the Anxiety Disorders Interview Schedule for DSM-IV: Parent version (Silverman and Albano, 1996) and confirmed by an experienced clinician. Sixteen percent (n = 25) had a comorbid diagnosis of a current depressive disorder (DD). Significantly more females than males had a DD. Those with a DD showed increased OCD symptom severity, OCD-related functional impairment, and family accommodation relative to those without a comorbid DD. Depressive symptoms were significantly positively correlated with years of age, degree of OCD symptom severity, measures of OCD-related functional impairment, and non-OCD anxiety symptoms. Hierarchical regression analyses showed that age, gender, functional impairment, and non-OCD anxiety were significant predictors of depressive symptoms, even when OCD symptom severity was controlled. Notably, functional impairment was a partial mediator of the relationship between OCD symptom severity and depression levels, suggesting depression levels are the product of both degree of symptoms and amount of day-to-day impairment. Results are discussed in terms of implications for assessment and treatment.

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