Wave 4 assessments were conducted from 2002 to 2005 with 3,787 twins (80% of twins identified from birth records) and contained detailed trauma history assessment. Wave 5 interviews were conducted between 2005 and 2008 with 3,428 twins. Data from Waves 1, 3, and/or 5 were available for 95.5% of Wave 4 participants. MOAFTS participants (n = 3787) included 2176 monozygotic (57.5%) and 1611 di-zygotic (42.5%) female twins. Ages of the female participants at the time of Wave 4 interview ranged from 18 to 29 years (M = 21.7; SD = 2.76). 14.6% percent of participants identified as AA and 85.4% as EA. MOAFTS Wave 4 was chosen as the CPA assessment time-point as it included the largest number of respondents, most intensive trauma assessment, and respondents were of similar age – emerging adulthood – as the baseline MOFAM respondents.
