title: Cognitive differences among diagnostic groups of retardates.
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D003071:Cognition; D003210:Concept Formation; D004314:Down Syndrome / Q000175:diagnosis*; D006801:Humans; D008607:Intellectual Disability / Q000145:classification / Q000175:diagnosis*; D011581:Psychological Tests; D012201:Reward