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Effects of Program Implementation on Adolescent Drug Use Behavior

The Midwestern Prevention Project (MPP)

University of Southern Californca

Elizabeth A. Trebow

University of Southern Californca

William B. Hansen

University of Southern Californca

David P. MacKinnon

University of Southern Californca

James H. Dwyer

University of Southern Californca

C. Anderson Johnson

University of Southern Californca

Brian R. Flay

Prevention Research Center, Chicago, IL

Stacey Daniels

Project STAR, Kansas City, MO

Calvin Cormack

Project STAR, Kansas City, MO

This study evaluated the relationship between level of program implementation and change in adolescent drug use behavior in the Midwestern Prevention Project (MPP), a school- and community-based program for drug abuse prevention. Trained teachers implemented the pro gram with transition year students. Implementation was measured by teacher self-report and validated by research staff reports. Adolescent drug use was measured by student self-report; an expired air measure of smoking was used to increase the accuracy of self-reported drug use. Regression analyses were used to evaluate adherence; exposure, or amount of implementation; and reinvention. Results showed that all schools assigned to the program condition adhered to the research by implementing the program. Exposure had a significant effect on minimizing the increase in drug use from baseline to one year. Exposure also had a larger magnitude of intervention effect than experimental group assignment. Reinvention did not affect drug use. Results are discussed in terms of research assumptions about quality of program implementation, and possible school-level predictors of implementation.

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