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  • Title: Epidemiology of severe mental retardation in children: community studies.
    Author: Abramowicz HK, Richardson SA.
    Journal: Am J Ment Defic; 1975 Jul; 80(1):18-39. PubMed ID: 126645.
    Abstract:
    Twenty-seven community studies of severe mental retardation, defined as IQ less than 50, were reviewed. The prevalence rate of this condition was about 4 per 1000 in older children; the rate was somewhat higher in males but did not vary by social class. About one-half of severely retarded children had significant associated handicaps. The cause of most cases of severe mental retardation is not known, but Down's syndrome accounted for one-sixth to one-third of cases and a small percentage were due to other chromosomal abnormalities, metabolic diseases, or infection.
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