4 J Can Acad Child Adolesc Psychiatry 18:1 February 2009 LETTER TO THE EDITOR Attention Deficit/Hyperactivity Disorder among Schoolchildren in Baghdad

A number of studies have examined the prevalence of ADHD in various countries. Variations in prevalence rates of ADHD exist between different studies due to such factors as the sources of information, assessment of clinical impairment, population characteristics, methodological features, ethnic and cultural differences and diagnostic criteria (Skounti et al., 2007). Studies of ADHD among school chil-dren yield prevalence rates ranging from 2.4% to 19%. Therefore the characterization of these factors is critical and the differences could throw light on identifying causative agents (Faraone et al., 2003). In children and adolescents the estimate