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National Heart getting Health Analytics. 1987. ?The fresh new Enhance on the Aging on the 1984 National Health Interviews Questionnaire.? Important and you may Health Statistics Series 1, No. 21. Arizona, DC: U.S. Regulators Printing Workplace.

Rivlin, Alice Meters. and you may Joshua M. Wiener, with Raymond J. Hanley and you will Denise Good. Spence. 1988. Arizona, DC: The fresh Brookings Institution.

A critical definitional question issues whether to matter while the disabled merely individuals ?researching active individual guidance? otherwise whether to include persons whom have confidence in ?unique devices otherwise mechanical helps? and you can persons requiring simply ?supervision otherwise stand-by recommendations