title: Clustering in nonretarded and retarded subjects: some basic determinants.
mesh_terms: D000293:Adolescent; D001244:Association; D002648:Child; D002657:Child Development; D002674:Child, Institutionalized; D003071:Cognition; D003463:Cues; D004193:Discrimination Learning; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007361:Intelligence Tests; D008297:Male; D008568:Memory; D014936:Word Association Tests