Studies in mental handicap. I. Prevalence and distribution by clinical type and severity of defect.
D000293:Adolescent; D002648:Child; D005260:Female; D006306:Health Surveys; D006801:Humans; D008607:Intellectual Disability / Q000145:classification* / Q000453:epidemiology*; D007360:Intelligence; D008297:Male; D012606:Scotland; D012924:Social Conditions