Stressful life events, genetic liability, and onset of an episode of major depression in women

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Abstract
OBJECTIVE: This study was undertaken to clarify how genetic liability and stressful life events interact in the etiology of major depression. METHOD: Information about stressful life events and onset of major depressive episodes in the past year was collected in a population- based sample of female-female twin pairs including 2,164 individuals, 53,215 person-months of observation, and 492 onsets of depression. RESULTS: Nine "personal" and three aggregate "network" stressful events significantly predicted onset of major depression in the month of occurrence, four of which predicted onset with an odds ratio of > 10 and were termed "severe": death of a close relative, assault, serious marital problems, and divorce/breakup. Genetic liability also had a significant impact on risk of onset of depression. For severe stressful events, as well as for 10 of the 12 individual stressful events, the best-fitting model for the joint effect of stressful events and genetic liability on onset of major depression suggested...