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November 2003, Vol 93, No. 11 | American Journal of Public Health 1837-1843
© 2003 American Public Health Association

ADOLESCENT HEALTH

Effects of a Social-Network Method for Group Assignment Strategies on Peer-Led Tobacco Prevention Programs in Schools

Thomas W. Valente, PhD, Beth R. Hoffman, MPH, Annamara Ritt-Olson, MA, Kara Lichtman, MA and C. Anderson Johnson, PhD

Thomas W. Valente, Beth R. Hoffman, Annamara Ritt-Olson, Kara Lichtman, and C. Anderson Johnson are with the Department of Preventive Medicine, School of Medicine, University of Southern California, Alhambra, Calif.

Correspondence: Requests for reprints should be sent to Thomas W. Valente, PhD, Department of Preventive Medicine, School of Medicine, University of Southern California, 1000 Fremont Ave, Building A, Room 5133, Alhambra, CA 91803 (e-mail: tvalente{at}usc.edu).

Objectives. Our study tested the effectiveness of network methods for identifying opinion leaders and for constructing groups.

Methods. Three conditions—random, teacher, and network—were randomly assigned to 84 6th-grade classrooms within 16 schools. Pre- and postcurriculum data on mediators of tobacco use were collected from 1961 students. Peer leaders in the network condition were identified by student nominations, and those leaders were matched with the students who nominated them.

Results. Students in the network condition relative to the random condition liked the prevention program more and had improved attitudes (ß = -0.06; P < .01), improved self-efficacy (ß = -0.10; P < .001), and decreased intention to smoke (adjusted odds ratio [OR] = 0.46; 95% confidence interval [CI] = 0.38, 0.55).

Conclusions. The network method was the most effective way to structure the program. Future programs may refine this technique and use it in other settings.




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