Cumulative adversity and posttraumatic stress disorder: evidence from a diverse community sample of young adults.

The authors hypothesized that a history of adversities, whether they were objectively traumatic or not, predicts risk for 1st onset of PTSD. Survival analysis in a community sample of 1,803 young adults revealed that risk is associated with retrospectively reported adverse experiences that occurred in years prior to the focal traumatic event. Analyses control for clustering of events proximal to onset. Implications for etiology and preventive intervention are noted.