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Dating violence (DV)—physical, sexual, and psychological aggression in adolescent romantic relationships—is prevalent among youth. Despite broad calls for primary prevention, few programs with demonstrated effectiveness exist. This cluster-randomized trial examined the effectiveness of a DV perpetration prevention program targeting coaches and high school male athletes.

The unit of randomization was the high school (16 schools), and the unit of analysis was the athlete (N = 2,006 students). Primary outcomes were intentions to intervene, recognition of abusive behaviors, and gender-equitable attitudes. Secondary outcomes explored bystander behaviors and abuse perpetration. Regression models for clustered, longitudinal data assessed between-arm differences in over-time changes in mean levels of continuous outcomes in 1,798 athletes followed up at 3 months.