endorsed at high rates in the two groups with high alcohol consumption, but were particularly high in the class 2 “diagnostic orphans” where 81% of those endorsing one criterion endorsed tolerance or drinking more than intended. Of the “diagnostic orphans” who endorsed two criteria, 59% endorsed both tolerance and drinking more than intended. The validity of these two criteria in young adult populations should be explored further. Drinking more than intended is one aspect of impaired control over alcohol use (Heather et al., 1993). Leeman et al. (2009b) found that self-reported impaired control predicted alcohol-related problems cross-sectionally and prospectively in an undergraduate sample, suggesting the possibility that drinking more than intended and other aspects of impaired control are indicative of problem drinking risk in young adults.
