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 methodsfor identifying opinion leaders and for constructing groups.
Methods. Three conditionsrandom, teacher, and networkwererandomly assigned to 84 6th-grade classrooms within 16 schools.Pre- and postcurriculum data on mediators of tobacco use werecollected from 1961 students. Peer leaders in the network conditionwere identified by student nominations, and those leaders werematched with the students who nominated them.
Results. Students in the network condition relative to the randomcondition liked the prevention program more and had improvedattitudes (ß = -0.06; P < .01), improved self-efficacy(ß = -0.10; P < .001), and decreased intentionto smoke (adjusted odds ratio [OR] = 0.46; 95% confidence interval[CI] = 0.38, 0.55).
Conclusions. The network method was the most effective way tostructure the program. Future programs may refine this techniqueand use it in other settings.
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