Abstract
This study evaluated the impact of a universal school-based violence prevention program on social-cognitive factors associated with aggression and nonviolent behavior in early adolescence. The effects of the universal intervention were evaluated within the context of a design in which two cohorts of students at 37 schools from four sites (N = 5,581) were randomized to four conditions: (a) a universal intervention that involved implementing a student curriculum and teacher training with sixth grade students and teachers; (b) a selective intervention in which a family intervention was implemented with a subset of sixth grade students exhibiting high levels of aggression and social influence; (c) a combined intervention condition; and (d) a no-intervention control condition. Short-term and long-term (i.e., 2-year post-intervention) universal intervention effects on social-cognitive factors targeted by the intervention varied as a function of students’ pre-intervention level of risk. High-risk students benefited from the intervention in terms of decreases in beliefs and attitudes supporting aggression, and increases in self-efficacy, beliefs and attitudes supporting nonviolent behavior. Effects on low-risk students were in the opposite direction. The differential pattern of intervention effects for low- and high-risk students may account for the absence of main effects in many previous evaluations of universal interventions for middle school youth. These findings have important research and policy implications for efforts to develop effective violence prevention programs.
Notes
Because nine schools were recruited at the Georgia site, random assignment resulted in two schools in three of the conditions and three schools assigned to the selective intervention condition.
Responses were screened for patterns that were clearly implausible. Two reviewers examined the data from students who gave the same response to every item in a scale or patterned responses (e.g., 1,2,3,2,1) throughout a scale, across multiple scales. The reviewers independently considered the plausibility of the patterns, the number of scales with implausible patterns, and the time taken to complete each scale, thereby identifying cases that each deemed problematic. The two reviewers then discussed these cases and came to consensus regarding which cases should be excluded from analyses. This resulted in the screening out of 10 cases or less from each wave.
This has an advantage over simpler models based on only the first two waves of data in that the inclusion of the additional waves of posttest data provides a more accurate estimate of each individual’s score at the end of the intervention year by making use of all available data.
Random effects were specified for intercepts and slopes at the student level, and for intercepts at the school level. The quadratic and fall-to-spring indicator were treated as fixed effects to facilitate the interpretation of intervention effects on linear slopes.
Degrees of freedom for main effects of the school-level variables (i.e., condition and site) were set at 30 (37 schools − 3 for condition − 3 for sites − 1 for intercept). Degrees of freedom for other effects were set at the number of individuals minus the number of individual-level terms and interactions in the model minus 1.
Random effects were specified for intercepts and slopes at the student level, and for intercepts at the school level. The quadratic and fall-to-spring indicator were treated as fixed effects to facilitate the interpretation of intervention effects on linear slopes.
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Acknowledgements
This study was funded by the National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, CDC Cooperative Agreements U81/CCU417759 (Duke University), U81/CCU517816 (University of Chicago, Illinois), U81/CCU417778 (The University of Georgia), and U81/CCU317633 (Virginia Commonwealth University). The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
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The MVPP corporate author group includes the following individuals listed by sites (sites arranged in alphabetical order) with their current affiliation noted in parentheses: Centers for Disease Control and Prevention, Atlanta GA: Thomas R. Simon, Robin M. Ikeda, Emilie Phillips Smith (Penn State University); Le’Roy E. Reese (Morehouse School of Medicine); Duke University, Durham NC: David L. Rabiner, Shari Miller-Johnson, Donna-Marie Winn (University of North Carolina – Chapel Hill), Kenneth A. Dodge, Steven R. Asher; University of Georgia, Athens GA: Arthur M. Horne, Pamela Orpinas, Roy Martin, William H. Quinn (Clemson University); University of Illinois at Chicago, Chicago IL: Patrick H. Tolan, Deborah Gorman-Smith, David B. Henry, Franklin N. Gay, Michael Schoeny, Virginia Commonwealth University, Richmond VA: Albert D. Farrell, Aleta L. Meyer (National Institute on Drug Abuse); Terri N. Sullivan, Kevin W. Allison.
Correspondence concerning this article should be addressed to Albert D. Farrell, Department of Psychology, Virginia Commonwealth University, P.O. Box 842018, Richmond, VA 23284-2018. E-mail: afarrell@vcu.edu.
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The Multisite Violence Prevention Project. The Multisite Violence Prevention Project: Impact of a Universal School-Based Violence Prevention Program on Social-Cognitive Outcomes. Prev Sci 9, 231–244 (2008). https://doi.org/10.1007/s11121-008-0101-1
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DOI: https://doi.org/10.1007/s11121-008-0101-1