Conservation of space in noninstitutionalized old people.
D000368:Aged; D000375:Aging; D003071:Cognition; D003210:Concept Formation; D004522:Educational Status; D005260:Female; D006798:Housing; D006801:Humans; D008297:Male; D008875:Middle Aged; D011582:Psychological Theory; D012657:Self-Help Groups; D012737:Sex Factors; D013028:Space Perception