The sample was composed of 3,787 women who completed Wave 4 (conducted from 2002 to 2005) of the Missouri Adolescent Female Twin Study – a longitudinal investigation of alcohol-related problems and associated psychopathology in female adolescents and young adults. Participants were identified through birth records born between July 1, 1975 and June 30, 1985 to Missouri-resident parents. Cohorts of 13, 15, 17, and 19 year-old twin pairs and their families were recruited from 1995 to 1999. Of those found eligible for participation, parental diagnostic interviews were collected at baseline in 78% of the families recruited. The Wave 4 assessment was chosen for the current investigation as it included the largest number of respondents and most intensive trauma assessment. Data from Waves 1, 3 and/or 5 were available for 95.5% of Wave 4 participants. Participant ages ranged from 18 to 32 years (M = 24.5; SD = 2.8) at the time of the most recent interview; 14.6% percent of participants identified as African-American (AA).
