Associations of Childhood and Adolescent Depression With Adult Psychiatric and Functional Outcomes

Objective: Depression is common, impairing, and the leading cause of disease burden in youths. This study aimed to identify the effects of childhood/adolescent depression on a broad range of longer-term outcomes. Method: The analysis is based on the prospective, representative Great Smoky Mountains Study of 1,420 participants. Participants were assessed with the structured Child and Adolescent Psychiatric Assessment interview up to 8 times in childhood (age 9 similar to 16 years; 6,674 observations; 1993-2000) for DSM-based depressive disorders, associated psychiatric comorbidities, and childhood adversities. Participants were followed up 4 times in adulthood (ages 19, 21, 25, and 30 years; 4,556 observations of 1,336 participants; 1999-2015) with the structured Young Adult Psychiatric Assessment Interview for psychiatric outcomes and functional outcomes. Results: In all, 7.7% of participants met criteria for a depressive disorder in childhood/adolescence. Any childhood/adolescent depression was associated with higher levels of adult anxiety and illicit drug disorders and also with worse health, criminal, and social functioning; these associations persisted when childhood psychiatric comorbidities and adversities were accounted for. No sex-specific patterns were identified. However, timing of depression mattered: individuals with adolescent-onset depression had worse outcomes than those with child-onset. Average depressive symptoms throughout childhood and adolescence were associated with more adverse outcomes. Finally, specialty mental health service use was protective against adult diagnostic outcomes. Conclusion: Early depression and especially persistent childhood/adolescent depressive symptoms have robust, lasting associations with adult functioning. Some of these effects may be attenuated by service use.