Alcohol trajectories were derived from age 14–29 data. As only 0.1% of participants at age 11 had ever used alcohol, this time point was dropped. Data from all three cohorts were combined in the trajectory analysis because growth mixture modeling techniques are well suited to individual developmental data that start and stop at different times or have missing values. In the current study, data were missing according to cohort length, but all three cohorts had mean AUI scores within 0.1 standard deviations at each age, and the overall pattern of scores across development was comparable (see Figure 1).
