THE SYSTEMATIC review and meta-analysis by Mytton et al1 represents an important contribution to knowledge. Their review is very carefully and competently executed, and it is certainly far better than most narrative or unsystematic reviews of this topic. The good news is that school-based violence prevention programs that target high-risk youth are effective in reducing aggressive behavior. The puzzling news is that the programs varied considerably in their effectiveness, and it was not clear why.
Farrington DP. The Effectiveness of School-Based Violence Prevention Programs. Arch Pediatr Adolesc Med. 2002;156(8):748-749. doi:10.1001/archpedi.156.8.748