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      Prevalence of intellectual disability: a meta-analysis of population-based studies.

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          Abstract

          Intellectual disability is an extremely stigmatizing condition and involves utilization of large public health resources, but most data about its burden is based on studies conducted in developed countries. The aim of this meta-analysis was to collate data from published literature and estimate the prevalence of intellectual disability across all such studies. The review includes studies published between 1980 and 2009, and includes data from populations that provided an overall estimate of the prevalence of intellectual disability. Meta-analysis was done using random effects to account for heterogeneity. Sub-group analyses were also done. The prevalence of intellectual disability across all 52 studies included in the meta-analysis was 10.37/1000 population. The estimates varied according to income group of the country of origin, the age-group of the study population, and study design. The highest rates were seen in countries from low- and middle income countries. Studies based on identification of cases by using psychological assessments or scales showed higher prevalence compared to those using standard diagnostic systems and disability instruments. Prevalence was higher among studies based on children/adolescents, compared to those on adults. Higher prevalence in low and middle income group countries is of concern given the limitations in available resources in such countries to manage intellectual disability. The importance of using standardized diagnostic systems to correctly estimate the burden is underlined. The public health and research implications of this meta-analysis have been discussed.

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          Author and article information

          Journal
          Res Dev Disabil
          Research in developmental disabilities
          Elsevier BV
          1873-3379
          0891-4222
          January 18 2011
          : 32
          : 2
          Affiliations
          [1 ] The George Institute for Global Health, Plot 839C, Road 44A, Jubilee Hills, Hyderabad 500033, India. pmaulik@georgeinstitute.org.in
          Article
          S0891-4222(10)00308-2
          10.1016/j.ridd.2010.12.018
          21236634
          53913a00-b6c1-4aca-a850-7de634ad90e0
          Copyright © 2010 Elsevier Ltd. All rights reserved.
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