Fifteen-year follow-ups included the Self Report of the Effects (SRE) of alcohol questionnaire, the Impulsiveness Subscale of the Karolinska Scales of Personality and the Zuckerman Sensation Seeking Scale (Gustavsson et al., 2000; Schuckit, 2018 a; Schuckit et al., 2016, 2019 a, b; Zuckerman, 1978). The SRE records numbers of standard drinks required for up to four effects including a first effect, feeling dizzy or slurring speech, unstable standing, and unplanned falling asleep. SRE-5 scores for the first five times of drinking and is generated by the total drinks in that period needed across effects divided by the number of effects endorsed. SRE-T scores reflect the average across first five, heaviest drinking period, and recent 3-month drinking. Higher average drinks needed for effects indicates lower response per drink and higher future risk for alcohol problems (Daeppan et al., 2000; Ray et al., 2010; Schuckit, 2018a; Schuckit et al., 2019 a, b). As probands’ biological children reached age 18, they were personally interviewed every five-years using SSAGA-based questions. The first interview following their 18th birthday included the impulsivity and sensation seeking questionnaires, and, for those with experience with drinking, the SRE.
