Polanczyk G, de Lima MS, Horta BL, Biederman J, & Rohde LA. The Worldwide Prevalence of ADHD: A Systematic Review and Metaregression Analysis . American Journal of Psychiatry. 2007 Jun; 164(6): 942-948. Child and Adolescent Psychiatric Division, Hospital de Clinicas de Porto Alegre, Rua Ramiro Barcelos, 2350, Porto Alegre, RS, Brazil 90035-003. OBJECTIVE: The worldwide prevalence estimates of attention deficit hyperactivity disorder (ADHD)/hyperkinetic disorder (HD) are highly heterogeneous. Presently, the reasons for this discrepancy remain poorly understood. The purpose of this study was to determine the possible causes of the varied worldwide estimates of the disorder and to compute its worldwide-pooled prevalence. METHOD: The authors searched MEDLINE and PsycINFO databases from January 1978 to December 2005 and reviewed textbooks and reference lists of the studies selected. Authors of relevant articles from North America, South America, Europe, Africa, Asia, Oceania, and the M...
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