en Psychiatry Psychiatry Original Research Original Research <p> <strong>ABSTRACT</strong></p><p> <strong>Background:</strong> Attention Deficit Hyperactivity Disorder (ADHD) is characterized by a developmental disorder involving inappropriate poor attention span or age-inappropriate features of hyperactivity and impulsivity and/or both.</p><p> <strong>Methods:</strong> In order to assess the prevalence of children with ADHD in Tehran, a sample of 2667 children including both boys & girls aged between 7-12 years were selected by a 2-stage method sampling among a grid of sectors of 19 different educational areas by stratified random sampling. We tested the rate of ADHD in the considered children based on two questionnaires of Conners Parent and Teacher Rating Scales (CPRS and CTRS) and semi-structured interviews.</p><p> <strong>Results:</strong> According to the recent studies, it is possible to describe the rate of ADHD prevalence based on the CPRS and CTRS questionnaires and semistructured interview among the primary school children in Tehran (aged between 7- 12 years of age) with a range of 3% to 6%.</p><p> <strong>Conclusion:</strong> These mentioned findings are somewhat similar to the announced statistics of the American Psychiatric Association (APA) (2003).</p> PREVALENCE, ADHD, PRIMARY SCHOOL STUDENTS, Tehrran 147 150 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-226&slc_lang=en&sid=1 K. KHUSHABI 20031947532846002382 20031947532846002382 Yes Department of Psychiatry,University of Welfare and Rehabilitation Sciences, Tehran, Iran H. POUR-ETEMAD 20031947532846002383 20031947532846002383 No Department of Psychology, Shahid Beheshti University M. MOHAMMADI 20031947532846002384 20031947532846002384 No Department of Psychiatry, Tehran University of MedicalSciences P. MOHAMMADKHANI 20031947532846002385 20031947532846002385 No Department of Psychology, University of Welfareand Rehabilitation Sciences