The merged data set included 5,056 MOTWIN subjects and 511 COGA subjects To minimize the likelihood of matching the maltreatment registry as a perpetrator rather than as a victim, cases with reports occurring after age 17 were deleted (MOTWIN=106; COGA=3). Individuals younger than 17 rarely appear as perpetrators. Because of the demographics of the region, analyses were restricted to Caucasian and African-American subjects, those of other ethnicity or with missing race data were deleted (MOTWIN=56; COGA=31). A number of the subjects were removed due to missing familial liability data (MOTWIN=242; COGA=13) or missing socioeconomic status (SES) data (MOTWIN=220; COGA=36). The above resulted in a final analysis sample of 4,432 subjects in MOTWIN, 428 subjects in COGA.
