Normative Perceptions of Peer Drinking Distinguish High-Intensity Drinkers from Other Drinking Groups.

: High-intensity drinking (HID), or drinking that doubles the binge threshold (i.e., 8+/10+ drinks for women/men), is associated with more negative consequences than binge-only drinking. However, research focusing on HID and factors that may delineate HID from other drinking behaviors is lacking. The present study evaluated if perceived norms for peer drinking behavior (i.e., descriptive norms for alcohol quantity and frequency and injunctive norms) differentiated high-intensity drinkers from other drinker statuses. Further, we evaluated the role of perceived norms on odds of HID engagement and HID frequency. Finally, college status, sex, and underage drinker status were evaluated as moderators of the association between perceived norms and HID status/frequency. : Participants were 623 emerging adult drinkers recruited Craigslist (68.7% male; 69.0% White). Participants completed an online survey on their drinking behaviors and related social factors. : Each domain of perceived norms positively associated with drinker status. Higher perceived norms were associated with greater odds of HID and predicted HID frequency. The association between quantity and frequency descriptive norms and HID engagement was stronger for nonstudents and was only significant for males. Underage drinker status did not moderate associations between perceived norms and HID engagement. : Findings provided evidence that perceptions of peer drinking behaviors are strong indicators of HID risk and may be especially useful for identifying high-intensity drinking males and nonstudents. The utility of perceived peer norms to differentiate this group of particularly risky drinkers suggests that social-influence-focused intervention approaches, including norms correction, may be efficacious in targeting HID among emerging adults.