Examining Intervention Component Dosage Effects on Substance Use Initiation in the Strengthening Families Program: for Parents and Youth Ages 10–14
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Family-based prevention programs increasingly are being disseminated and can be effective for an array of adolescent problem behaviors, including substance use initiation. Yet, we continue to have little understanding of how and why these programs work. Increased specificity in our understanding of what components drive program effects can facilitate refinement of programs, with potential for greater impact at a lower cost. Using attendance data, previously coded intervention components, and a previously developed propensity model to adjust for potential bias, this study evaluated content component-specific dosage effects of the Strengthening Families Program: for Parents and Youth Ages 10–14 on three substance use initiation outcomes by grade 12. Results indicated that greater dosages of program content related to (a) parental monitoring and behavior management strategies and (b) promoting positive family relationships had potent and robust effects on reduction of risk for initiating drunkenness and marijuana use and (c) self-regulation and stress management had potent and robust effects on reduction of risk for initiating cigarette and marijuana use. Results indicate potential critical components within SFP 10–14 and offer a path forward for continuing work in efforts to optimize this widely disseminated program.
KeywordsFamily-based intervention Substance use prevention Propensity scores Component analysis
This research was supported by grant R01-DA013709 from the National Institute on Drug Abuse and co-funded by the National Institute on Alcohol Abuse and Alcoholism. This project was supported by the Prevention and Methodology Training Program (T32 DA017629; PI: L.M. Collins) funded by the National Institute on Drug Abuse.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent/assent was obtained from all adolescents/parents included in the study.
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