American Journal of Epidemiology Vol. 146, No. 5: 418-428
Copyright © 1997 by The Johns Hopkins University School of Hygiene and Public Health
research-article |
Proxy Reporting in Five Areas of Functional Status
Comparison with Self-Reports and Observations of Performance
From theDepartment of Epidemiology and Preventive Medicine, School of Medicine, University of Maryland Baltimore, MD
Reprint requests to Dr. Jay Magaziner, University of Maryland School of Medicine, 660 West Redwood Street, Suite 200, Baltimore, MD 21201
Proxy ratings of functional status were compared with subject self-reports in five domains relevant to the study of older persons and with observations of subject performance in two areas (physical and instrumental functioning). Data were derived from 233 proxy-subject pairs evaluated in a prospective study of hip fracture patients aged 65 years or more in Baltimore, Maryland (1990–1991). Agreement between proxy and subject reports was highest for a summary measure of instrumental functioning and lowest for a measure of depression. Proxies tended to report more disability than did subjects, although bias varied by function. Patterns of agreement for proxy reports versus observations of performance compared with patterns for proxy reports versus subject reports were lower for measures of instrumental functioning, and bias was generally more extreme for instrumental and physical functioning measures. The authors conclude that agreement and bias differ by functional domain, by the way summary measures are created and scored, and by the criterion against which proxy reports are compared.
activities of daily living; aged; cognition; data collection; epidemiologic methods; frail elderly; questionnaires; research design
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