Participants were entered into a matching program to be paired with another participant with similar demographic characteristics (sex, ethnicity, height, and weight) as well as similar alcohol use (typical quantity and frequency of alcohol use) but opposite level of response to alcohol (high versus low) to ensure that individuals in each group were similar on other variables impacting alcohol use that might confound the analyses. Matched pairs of participants were then randomly assigned to one of two alcohol prevention modules: a non-targeted, State of the Art (SOTA) prevention program, or a similar program that focused on LR as a risk factor for heavy alcohol use and problems (Level of Response-Based; LRB), resulting in four total groups: high LR-LRB, high LR-SOTA, low LR-LRB, and low LR-SOTA. For 27 individuals, a suitable pair member could not be assigned, resulting in 52 pairs and 12 singletons in the LRB group and 50 pairs and 15 singletons in the SOTA group.
