The threshold used to select subjects for the DRN have been used before to detect hazardous drinking (Vergara et al., 2016; Weiland et al., 2014) and corresponds to the minimum criteria for at-risk drinking (Babor et al., 2001). The SMK group was selected with a more conservative threshold than previously utilized for training of machine learning algorithms (Pariyadath et al., 2014). Other relevant data collected included the Beck Depression Inventory (BDI) (Beck et al., 1988), the Impulsive Sensation Seeking Scale (ImpSS) (Zuckerman, 1996) and income as socio-economic status variable. Income was categorized in 7 levels: 1-$0-$9,999/year, 2-$10,000-$19,999/year, 3-$20,000-$29,999/year, 4-$30,000-$39,999/year, 5-$40,000-$49,999/year, 6-$50,000-$59,999/year, and 7-Over $60,000/year.
