Figure 2 plots age of attainment (adjusted for covariates) for each milestone by sex, age of onset, and race. Significant age-of-onset differences in age of attainment were observed, with non-overlapping ages for early milestones but convergence by later milestones whereby earlier initiating youth “caught up” to later initiating youth. Significant sex differences were observed for age of weekly HED and age of daily HED. Finally, a significant race difference was observed for age of daily HED. Although the figures include only those 494 individuals who attained all drinking milestones (i.e., no censoring), the same patterns were evident if only the first four (n=1,148), three (n=2,188), or two (n=2,645) milestones were considered.
