Changes in the patient population of a hospital for the mentally retarded.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006778:Hospitals, Psychiatric; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008607:Intellectual Disability; D007361:Intelligence Tests; D008962:Models, Theoretical; D013223:Statistics as Topic