Two-year gains in moral conduct by retarded and nonretarded persons.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002605:Character; D002648:Child; D002657:Child Development; D002755:Choice Behavior; D003071:Cognition; D003657:Decision Making; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D009014:Morals; D011582:Psychological Theory; D012107:Research Design; D013997:Time Factors