Mental subnormality in Northern Ireland.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000453:epidemiology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000145:classification / Q000453:epidemiology*; D007360:Intelligence; D008297:Male; D008875:Middle Aged; D009660:Northern Ireland; D012606:Scotland; D012737:Sex Factors