Predicting Alcohol Use in Undergraduates: Interactions Between Social Anxiety and Impulsivity.

Background: Links between social anxiety and risky drinking in college are well documented, but the specifics of this relationship are mixed and likely complex. Impulsivity may play a critical role in enhancing vulnerability for risky drinking in individuals with social anxiety. Objectives: Here we examined how impulsivity moderates the relationship between social anxiety and alcohol use in college students. 515 undergraduates (18-24 years) who endorsed at least moderate levels of alcohol use were included. Participants completed self-report questionnaires to quantify social anxiety, impulsive personality traits, and alcohol use. A series of correlations and stepwise linear regressions were conducted to examine social anxiety, impulsivity, biological sex, and their interactions as predictors of amount of alcohol use. Results: We found that multiple facets of impulsivity moderated the relationship between social anxiety and amount of alcohol use. Social anxiety was associated with more alcohol use in participants with high lack of premeditation, while social anxiety was associated with less alcohol use in participants with low lack of premeditation, low negative urgency, and high sensation seeking. Sex interacted with social anxiety; low levels of impulsivity seemed to be protective. Conclusion: Our results demonstrate that social anxiety and certain facets of impulsivity (lack of premeditation, sensation seeking) interact to predict alcohol use in undergraduates. These findings highlight the complex and important relationships between social anxiety, impulsivity, and risky drinking in college students.