'Conduct disorder' and juvenile delinquency

12 and 13-year-olds with 'conduct disorder' are much more likely to engage in violent and delinquent behaviour as teenagers. Researchers from the Universite de Montreal studied 4,125 children, following them over a number of years. They found that the 12- and 13-year-olds with conduct disorder who displayed violent behaviour were six times as likely to sell illicit drugs, nine times as likely to join a gang and 11 times as likely to carry a weapon; they were also eight times as likely to be arrested. Children with conduct disorder who weren't violent were also more likely to behave badly being three times as likely to sell illicit drugs, four times as likely to join a gang and three times as likely to mug someone using a weapon.