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This study examined whether children who initiate physical fights are impulsive as measured by a continuous performance test. A series of 111 7-13-year-old psychiatric patients were diagnosed using DSM-III-R criteria and divided according to whether they showed a persistent pattern of initiating physical fights. Children who initiated fights were impulsive irrespective of whether ADHD was present or not, although ADHD was also associated with increased impulsivity. Oppositional-defiant disorder and conduct disorder diagnoses were not associated with impulsivity. These findings are discussed in terms of an underlying impulsive personality trait and its possible relationship to outcome in children with disruptive behavior disorders.

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