Oppositional defiant disorder-gender differences in co-occurring symptoms of mental health problems in a general population of children.

Informant- and gender-specific characteristics of Oppositional Defiant Disorder (ODD) and how these might relate to patterns of comorbidity need to be further clarified. We collected data from 7,007 children (aged 7-9) who participated in the Bergen Child Study (BCS), an ongoing population-based study of children's development and mental health. A questionnaire containing the DSM-IV behavioral descriptions of ODD was distributed to parents and teachers.