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Summary: This report was prepared by University of Antioquia, School of Public Health, Columbia; Dalhousie University, Maritime School of Social Work Halifax, NS, Canada; and the Colombian Health Association. The full title of this report is: Early prevention of aggressive behaviour, psychoactive substance abuse, and low school performance in colombia: quasi-experimental longitudinal study of children in poor communities with high levels of violence and social inequity. Further information: This report was part of the Canadian International Development Agency's (CIDA) child protection research fund. Â Â