Mental growth from six to sixty in an institutionalized mentally retarded sample.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D007360:Intelligence; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged