Classroom Based Substance Use Prevention Programs: A Meta-analysis

This paper reports on a meta-analysis performed on forty one studies evaluating classroom-based substance abuse primary prevention programs. Studies included were delivered in a classroom to the general student body, had a primary focus of substance abuse prevention, measured behavior change, and were published in peer-reviewed outlets between 2000 and 2011. Comprehensive Meta-Analysis was used to calculate a random effects Cohen’s d and moderator analyses. Results indicated a significant effect for alcohol (d=0.10) and tobacco (d=0.09) in multi-target interventions. Specific program components and characteristics associated with more effective prevention programs are discussed. Despite the best efforts of those who develop and deliver intervention programs, as a whole, the impact is smaller than “small.” New or evolved programs should seek to incorporate the best predictors of effectiveness thereby improving efficacy.