To evaluate alcohol misuse in the past year, participants completed the AUDIT (Saunders et al. 1993). We only included subjects who answered yes to the question “Have you ever in your life used alcohol” (i.e., “ever drinkers” vs “never drinkers”). The ten-item AUDIT questionnaire yields scores from 0 to 40. Since the scores were not normally distributed (by visual inspection, Figure 1), we used a log-10 transformation, which is frequently employed to approximate a normal distribution for AUDIT (Supplementary Table 2).
