We then used empirically identified groups as the outcome variable in subsequent logistic regression analyses. We formally tested the following six individual and situational factors as predictors of change in the context of a PFI: incident seriousness, readiness to change, positive alcohol expectancies, gender, first-year student, and other drug use. We then examined whether the efficacy of a PFI delivered in the context of a BMI and a written PFI differed depending on individual and situational factors, as well as baseline HED and AP (i.e., differential efficacy of the PFI types by individual and situational factors). Thus, we tested for moderation effects by examining the interaction between PFI condition and each of the predictors.
