AI-SUPERPFP interview questions assessing trauma exposure and PTSD diagnostic status derived from multiple sources [3,19,20]. The PTSD module was a modified version of the Composite International Diagnostic Interview [21,22] based on DSM-IV [1] criteria. The instrument included 15 common traumas most often linked to a diagnostic assessment of PTSD in American Indian and other populations. Types of trauma were aggregated into four common domains: interpersonal traumas, such as sexual or physical assaults and domestic, spousal or child abuse (7 items); non-interpersonal trauma, specifically disasters or accidents (2 items); witnessed trauma, such as observed assaults or accidents (3 items); and significant trauma experienced by close friends or family (3 items) [3,19,20]. A final question asked about other traumas. Assessment of the worst event was obtained as follows: “You told me you had been in several extremely stressful situations. I'll repeat the situations you told me about. I'd like you to think about the 3 times that were the worst.” The analyses that follow focused on the trauma that each participant prioritized first in his or her list of worst experiences.