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We examine U.S. and Canadian children with symptoms of Attention Deficit Hyperactivity Disorder (ADHD), the most common child mental health problem. ADHD increases the probability of delinquency and grade repetition, reduces future reading and mathematics scores, and increases the probability of special education. The estimated effects are remarkably similar in the two countries, and are robust to many specification changes.Moreover, even moderate symptoms have large negative effects relativedoi:10.3386/w10435 fatcat:swa6pvo3cnal7fnqdugau5ma7u