Alcohol milestones were defined as the age of the first: whole drink, intoxication, DSM-5 AUD symptom(s), and DSM-5 AUD diagnosis (Supplemental Methods). Consistent with prior COGA-P work (Bucholz et al., 2017; McCutcheon et al., 2018), transitions between these milestones (dichotomously coded 0/1 at each year within-person) were defined as follows: age 0 to first drink, first drink to first intoxication, first drink to first AUD symptom, and first drink to first AUD diagnosis (Table 2).
