First onset versus recurrence of depression: Differential processes of psychosocial risk.

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Abstract
Differential risk factors for the onset of depression were prospectively examined in a community-based sample of adolescents (N = 1,709), some of whom had a history of major depressive disorder (MDD; n = 286) and some of whom did not (n = 1,423). From the theories of J. Teasdale (1983, 1988) and R. Post (1992) concerning the etiology of initial versus recurrent episodes of depression, the authors hypothesized that (a) dysphoric mood and dysfunctional thinking styles would be correlated more highly among those with a previous history of MDD than among those without a history of MDD; (b) dysphoric mood or symptoms and dysfunctional thinking would be a stronger predictor of onset of recurrent episodes (n = 43) than of first onsets (n = 70); and (c) major life stress would be a stronger predictor of first onsets of MDD than of recurrent episodes. The results provide support for the 3 hypotheses and suggest that distinct processes are involved in the onset of first and recurrent episodes of MDD.

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