Adult onset of major depressive disorder in relation to early life violentvictimisation: a case-control study

Background Major depressive disorder is a significant cause of morbidity am ong women in the USA. Women are twice as likely as men to be diagnosed with major depressive disorder, yet no known risk factors can account for this sex difference. We aimed to assess violent victimisation as a risk factor f or depression in women. Methods We undertook a case-control study to assess the association between violent victimisation early in life and major depressive disorder in women . We randomly selected a population-based sample of women, aged 36-45 years , from the greater Boston area. In 1999, 236 cases and 496 controls (n=732) completed a self-administered questionnaire designed to ascertain a lifeti me history of exposure to violent victimisation. Our main outcome measure w as major depressive disorder, assessed by structured clinical interview for Diagnostic Statistical Manual IV (DSM-IV) criteria. Findings 363 (50%) of 732 respondents reported experience or fear of abuse as a child or adolescent. 68 were excluded because they reported violence a s an adult only. Compared with women who reported no abuse, risk of depress ion was increased in women who reported any abuse as a child or adolescent (relative risk 2.5, 95% CI 1.9-3.0), physical abuse only (2.4, 1.8-3.0), se xual abuse only (1.8, 1.2-2.8), and both physical and sexual abuse (3.3, 2. 5-4.1). Severity of abuse had a linear dose-response relation with depressi on. Interpretation Our results suggest a positive association between violent v ictimisation early in life and major depressive disorder in women.