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Published on: September 30, 2020
Measures of functional status in community-dwelling elders
1Multicampus Program in Geriatric Medicine and Gerontology, UCLA School of Medicine, and the Department of Veterans Affairs Medical Center, Sepulveda, Calif 91343, USA.
Objective:
To evaluate two performance-based measures of functional status and assess their correlation with self-report measures.
Design:
Cross-sectional study.
Participants:
Of the 363 community-dwelling elders enrolled in a trial of comprehensive geriatric assessment who participated, all had at least one of four target conditions (urinary incontinence, depression, impaired functional status, or history of falling).
Measurements:
Two performance-based measures, National Institute on Aging (NIA) Battery, and Physical Performance Test (PPT), and three self-report functional status measures, basic and intermediate activities of daily living and the Short-Form-36 (SF-36) physical functioning subscale, were used. Measures of restricted activity days, patient satisfaction and perceived efficacy were also used.
Main Results:
All measures were internally consistent. There was a high correlation between the NIA and PPT (kappa = 0.71), while correlations between the performance-based and self-report measures ranged from 0.37 to 0.50. When patients with values above the median on the two performance-based measures were compared with those below, there were significant differences (p
Conclusions:
Performance-based measures correlated highly with each other and moderately with questionnaire-based measures. Performance-based measures also had construct validity and did not suffer from floor or ceiling effects.
