Data from a semistructured psychiatric diagnostic assessment conducted 1996–2000 via telephone (Heath et al. 2001) with a large Australian volunteer twin panel (Cohort II, born between 1964 and 1971) were used to ascertain families. High‐risk families were those in which at least one twin endorsed a screening question on CSA (5 total) or CPA (4 total); in control families, no twin endorsed any of these items. Verbal consent, obtained preinterview, was confirmed by return of a signed consent form allowing use of interview data as per procedures approved by the QIMR Berghofer Medical Research Institute (QIMR) Ethics Committee and the Washington University School of Medicine (WUSM) Human Research Protection Office (HRPO). 3407 respondents from 524 high‐risk and 373 control families completed telephone interviews 2003–2008 and provided postinterview consents. Data from 2594 twin and sibling respondents with childhood trauma assessment available (parents [N = 813] were not similarly assessed) are reported including 1532 twins (996 female [65.0%]) and 1062 nontwin siblings (625 female [58.9%]). The mean age at interview was 37.2 years (SD 2.3) for twins and 40.6 years (SD 6.3) for siblings.
