behaviors, substance use patterns and associated problems, and psychiatric symptoms that may have occurred at any point in participants' lifetimes. All first‐degree relatives aged 7 or older were sought for interview with developmentally appropriate versions of the SSAGA. In addition, for children ages 7–17, parental corroborating interviews were obtained. 9 In addition to the SSAGA interview, individuals completed personality assessments and were administered a family history assessment. 10 This was considered the core COGA protocol. (See Table 1 for assessments conducted at each data collection wave, including neurophysiological and neuropsychological evaluations.)
