Effectiveness of interventions to prevent youth violence a systematic review.

Objectives: To identify interventions effective in preventing youth violent behavior and commonalities of effective and ineffective interventions.

Methods: A systematic review of the literature on the effectiveness of youth violence interventions was conducted. Interventions were categorized according to the level of the intervention: primary (implemented universally to prevent the onset of violence), secondary (implemented selectively with youth at increased risk for violence), and tertiary (focused on youth who had already engaged in violent behavior).