The Worldwide Prevalence of ADHD: A Systematic Review and Metaregression Analysis
2007/06/01 by Guilherme V. Polanczyk, Guilherme Polanczyk, Maurício Silva de Lima +4 · 5,350 citations
Medicine · Neuroscience · Psychology · #Attention Deficit Hyperactivity Disorder #Biology #Internal medicine #MEDLINE #Medicine #Meta-analysis #Neuroethics, Human Enhancement, Biomedical Innovations #Psychology #Psychosomatic Disorders and Their Treatments #Systematic review
paper · doi:10.1176/ajp.2007.164.6.942
published in American Journal of Psychiatry 164(6), 942-948 (American Psychiatric Association)
openalex publication_date 2007/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract
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 Middle East and ADHD/HD experts were contacted. Surveys were included if they reported point prevalence of ADHD/HD for subjects 18 years of age or younger from the general population or schools according to DSM or ICD criteria. RESULTS: The literature search generated 9,105 records, and 303 full-text articles were reviewed. One hundred and two studies comprising 171,756 subjects from all world regions were included. The ADHD/HD worldwide-pooled prevalence was 5.29%. This estimate was associated with significant variability. In the multivariate metaregression model, diagnostic criteria, source of information, requirement of impairment for diagnosis, and geographic origin of the studies were significantly associated with ADHD/HD prevalence rates. Geographic location was associated with significant variability only between estimates from North America and both Africa and the Middle East. No significant differences were found between Europe and North America. CONCLUSIONS: Our findings suggest that geographic location plays a limited role in the reasons for the large variability of ADHD/HD prevalence estimates worldwide. Instead, this variability seems to be explained primarily by the methodological characteristics of studies.
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