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Early Prevention of Life-Course Personal and Property Violence: A 19-Year Follow-Up of the Montreal Longitudinal-Experimental Study (MLES)

NCJ Number
Journal of Experimental Criminology Volume: 9 Issue: 4 Dated: December 2013 Pages: 411-427
Frank Vitaro; Mara Brendgen; Charles-Edouard Giguere; Richard E. Tremblay
Date Published
December 2013
17 pages
This study assessed the impact of a multi-component prevention program on personal and property violence across three developmental periods (early adolescence, mid-adolescence and late adolescence/early adulthood).

The preventive intervention targeted disruptive kindergarten boys from low socioeconomic status families when they were 7 through 9 years of age. A randomized control trial was conducted to assess the impact of the preventive intervention relative to a control group. Two different approaches to data analysis were adopted: an intention-to-treat (ITT) approach and an instrumental variable (IV) approach. Results from the ITT analysis showed that the level of property violence for the intervention group was persistently lower across the three developmental periods compared to the control group. However, the intervention group did not differ from the control group on personal violence throughout adolescence and early adulthood. Results from the IV analysis generally confirmed these findings. The discussion focuses on the differential effects of the prevention program on personal versus property violence. Abstract published by arrangement with Springer.