Heavy drinking and its consequences among college students represent a serious public health problem, and peer social networks are a robust predictor of drinking-related risk behaviors. In a recent trial, we administered a Brief Motivational Intervention (BMI) to a small number of first-year college students to assess the indirect effects of the intervention on peers not receiving the intervention. OBJECTIVES: To present the research design, describe the methods used to successfully enroll a high proportion of a first-year college class network, and document participant characteristics. METHODS: Prior to study enrollment, we consulted with a student advisory group and campus stakeholders to aid in the development of study-related procedures. Enrollment and baseline procedures were completed in the first six weeks of the academic semester. Surveys assessed demographics, alcohol use, and social network ties. Individuals were assigned to a BMI or control group according to their dormitory location. RESULTS: The majority of incoming first-year students (1342/1660; 81%) were enrolled (55% female, 52% nonwhite, mean age 18.6 [SD=0.51]). Differences between the intervention and control group were noted in alcohol use, but were in large part a function of there being more substance-free dormitory floors in the control group. CONCLUSIONS: The current study was successful in enrolling a large proportion of a first-year college class and can serve as a template for social network investigations.

OBJECTIVE: There is a general perception on college campuses that alcohol use is normative. However, nondrinking students account for 40% of the U.S. college population. With much of the literature focusing on intervening among drinkers, there has been less of a focus on understanding the nondrinker college experience. The current study has two aims: to describe the social network differences between nondrinkers and drinkers in a college setting, and to assess perceived social exclusion among nondrinkers. METHOD: First-year U.S. college students (n = 1,342; 55.3% female; 47.7% non-Hispanic White) were participants in a larger study examining a social network of one college class and network associations with alcohol use. Alcohol use, sociocentric and egocentric network ties were assessed, as were experiences of social exclusion related to nondrinking. RESULTS: Drinking homophily based on past-month use was found; students tended to associate with others with a similar drinking status. Compared with drinkers, nondrinkers received fewer network nominations within the first-year network and made more nominations outside the first-year network. Nondrinkers' perceived social exclusion was positively related to the number of drinkers in their social networks, such that those with more drinkers in their network reported more social exclusion. CONCLUSIONS: College students' past-month drinking status in the first semester of college is related to their network position and perception of social exclusion. Nondrinking students who are part of a nondrinking community are less likely to feel socially excluded. Improving our understanding of the nondrinker college experience should improve support services for these students.

INTRODUCTION: Adolescent and young adult binge drinking is strongly associated with perceived social norms and the drinking behavior that occurs within peer networks. The extent to which an individual is influenced by the behavior of others may depend upon that individual's resistance to peer influence (RPI). METHODS: Students in their first semester of college (N=1323; 54.7% female, 57% White, 15.1% Hispanic) reported on their own binge drinking, and the perceived binge drinking of up to 10 important peers in the first-year class. Using network autocorrelation models, we investigated cross-sectional relationships between participant's binge drinking frequency and the perceived and actual binge drinking frequency of important peers. We then tested the moderating role of RPI, expecting that greater RPI would weaken the relationship between perceived and actual peer binge drinking on participant binge drinking. RESULTS: Perceived and actual peer binge drinking were statistically significant predictors of participant binge drinking frequency in the past month, after controlling for covariates. RPI significantly moderated the association between perceptions of peer binge drinking and participant's own binge drinking; this association was weaker among participants with higher RPI compared to those with lower RPI. RPI did not interact with the actual binge drinking behavior of network peers. CONCLUSIONS: RPI may function to protect individuals from the effect of their perceptions about the binge drinking of peers, but not from the effect of the actual binge drinking of peers.