Age of onset distributions are presented for Mild AUD (Figure 2a), Moderate AUD (Figure 2b), and Severe AUD (Figure 2c). The distributions include drinking milestones (first drink, first regular drinking) as well as onset ages for the diagnoses of Mild AUD (Figure 2a–c), Moderate AUD (Figure 2b,c) and Severe AUD (Figure 2c only). As noted above, the study samples are independent of each other for analytic purposes, and are classified according to the most severe disorder that the subject met criteria for during the observation period.