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Background: The purpose of this study was to address a dearth in the literature on non-response bias in parent-based interventions (PBIs) by investigating parenting constructs that might be associated with whether a parent volunteers to participate in a no-incentive college drinking PBI. Method: Incoming first-year students (N = 386) completed an online questionnaire that included items assessing plausible predictors of participation in a PBI (students' drinking, perceptions of parents' harm-reduction and zero-tolerance alcohol communication, whether parents allowed alcohol, and changes in parents' alcohol rules). Four months later, all parents of first-year students at the study university were invited to join the PBI, which was described as a resource guide to teach them how to help their student navigate the college transition and prepare them for life at their university. Results: Parents who signed up for the intervention used greater harm-reduction communication than those who did not sign up, were more likely to have allowed alcohol use, and signing up was significantly associated with student reports that fathers became less strict toward drinking after high school. Students' drinking and zero-tolerance communication did not significantly differ between the groups. Conclusion : Results indicate that non-response bias can be an issue when utilizing a real-world, non-RCT recruitment approach to invite parents into a PBI (i.e., non-incentivized, inviting all parents). Findings suggest that more comprehensive recruitment strategies may be required to increase parent diversity in PBIs.

Background: Prepartying, or drinking before an event where more alcohol may or may not be consumed, has been positioned in the literature as a behavior engaged in by heavy drinkers. However, recent findings suggest that prepartying may confer distinct risks, potentially causing students to become heavier drinkers over time., Objectives: The goals of this study were to disentangle the longitudinal relationships between prepartying, general and episodic alcohol consumption, and alcohol-related consequences by investigating (1) whether prepartying is associated with future consequences above and beyond current alcohol consumption habits and (2) whether augmentations in approval for alcohol and related increases in drinking mediate this relationship., Methods: One-hundred and ninety-five undergraduates completed online questionnaires at baseline, 6 months, and 12 months later., Results: Prepartying frequency was more strongly related to alcohol-related consequences one year later than was overall or episodic drinking. In addition, a path mediation model confirmed our hypothesis that this relationship is due to gradual increases in drinking which occur as a result of more approving attitudes toward alcohol brought on by exposure to prepartying. Conclusion/Importance: Findings suggest a new model for conceptualizing the relationship between prepartying, drinking, and consequences whereby students who get involved in prepartying may witness slow increases in their approval for alcohol use and, as a result, consumption. Importantly, results suggest that the increases in drinking displayed by prepartiers over the course of a year may account for the strong relationship between prepartying and later consequences. Prevention and intervention initiatives may benefit from directly targeting prepartying as a means of tempering risky alcohol use trajectories during one's college tenure.