Evaluating Selection Effects in a Parent-Based College Alcohol Intervention
Selection effects have been found in health intervention research but have not yet been examined in parent-based alcohol interventions (PBIs). Investigating such effects has been difficult because previous PBI research has only invited specific parents to participate and offered them compensation. The current study investigated selection effects using a recruitment strategy that would occur in a real-world context (i.e., inviting all parents and not paying them to participate). Incoming first-year students (N=386) completed an online questionnaire that included items assessing plausible predictors of participation in a PBI (perceptions of parents’ harm-reduction and zero-tolerance alcohol communication, whether parents allow 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. Students who had a parent sign up for the intervention perceived their parents as using greater harm-reduction communication, were more likely to perceive them as allowing alcohol use, and perceived their fathers as relaxing alcohol rules more than those who did not have a parent sign up. Zero-tolerance communication did not significantly differ between the groups. Results indicate that biases may exist in PBIs, with parents who use more harm-reduction parenting being more likely to sign up when parents are invited using real-world recruitment strategies. Findings suggest that more comprehensive recruitment strategies may be required to increase parent diversity in PBIs.