Impact of two social-cognitive interventions to prevent adolescent substance use: test of an amenability to treatment model

Abstract

An amenability to treatment model stipulates that interventions may be differentially effective for subgroups of individuals with similar characteristics. Using such a model, the present study tests the impact of two social-cognitive interventions implemented in the sixth (Intervention I) and eighth/ninth (Intervention II) grades on students' skill acquisition and on their ninth and tenth grade substance use. A randomized factorial design was used to examine main and interaction effects within the context of student family household status and gender. Positive program effects were found for Intervention II on skill acquisition and overall drug involvement. Interaction effects of Intervention II x Family Household Status provided support for the amenability to treatment model, but no support for the model was observed based on student gender. Possible explanations for the study findings are presented and future research directions are proposed to address why differences emerge in amenability to intervention and why such differences occur for specific subgroups.