An alcohol consumption variable was created from the Drinking and Drug History (DDHx) Questionnaire (Zucker, 1991; Zucker and Fitzgerald, 1994; Zucker et al., 1990). Participants were asked: how many days/month they drank over the past 6 months; and on a day when they drink, how many drinks they usually have in 24 hours over the same interval. A drinking volume (DV) variable (days/month x usual number of drinks) was created using square root transformation ( 1+x) (Osborne, 2002) and found normally distributed with a one-sample Kolmogorov-Smirnov (KS) test across and within groups (p’s>0.06).
