Prevalence of mental subnormality in northern Ireland and north-east Scotland.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000453:epidemiology; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology*; D007494:Ireland; D008875:Middle Aged; D012606:Scotland