title: Behavior of low-grade institutionalized mongoloids: changes with age.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000375:Aging; D001519:Behavior; D002648:Child; D002652:Child Behavior; D002653:Child Behavior Disorders; D002674:Child, Institutionalized; D002675:Child, Preschool; D004314:Down Syndrome / Q000175:diagnosis*; D004739:England; D006778:Hospitals, Psychiatric; D006801:Humans; D007223:Infant; D008875:Middle Aged; D009043:Motor Activity; D011581:Psychological Tests