Longitudinal changes in intellectual and social development of non-institutionalized retardates.
D000367:Age Factors; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007360:Intelligence; D008297:Male; D012919:Social Behavior; D013223:Statistics as Topic