Study children attended a research clinic at age 10.5 where they reported on their satisfaction/engagement with their friends, based on a series of questions from the Cambridge Hormones and Moods project Friendship questionnaire (Goodyer et al., 1987). In addition, they reported on deviant behaviors in their friends, based on the following list of behaviors: skipped school, told off by teacher, destroyed something for fun, set fire to something, stolen something, gotten into fights/cruel to animals, trouble with the police, smoked cigarettes, drunk alcohol without parental permission, been offered illegal drugs, and smoked cannabis.
