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Reliability of physical performance tests in four different randomized clinical trials
J L Purser1, C F Pieper, P W Duncan
1Claude D. Pepper Older Americans Independence Center, Center for the Study of Aging and Human Development, Department of Physical and Occupational Therapy, Duke University Medical Center, Durham, NC 27710, USA.
Archives of Physical Medicine and Rehabilitation
|May 18, 1999
Summary
Physical performance tests show reliable results across diverse elderly groups and varying time intervals. These measures are stable, making them suitable for broad clinical and research applications in aging populations.
Area of Science:
- Gerontology and Rehabilitation Science
- Biomedical Engineering
- Clinical Assessment
Background:
- Physical performance tests are crucial for assessing functional status in elderly populations.
- Understanding the reliability and stability of these tests across different impairment levels is essential for accurate clinical decision-making.
- Existing data on test-retest reliability in diverse elderly groups and across various time intervals requires further investigation.
Purpose of the Study:
- To evaluate the test-retest reliability of physical performance tests in elderly individuals with varying degrees of impairment and disability.
- To determine the stability of these physical performance tests over short (1 day) and longer (1 week) time intervals.
Main Methods:
- A test-retest, repeated measures reliability design was employed.
- Participants included community-dwelling elders, elders with Parkinson disease, older women with vertebral osteoporosis, and nursing home residents.
- Measures included lower extremity isometric strength, spinal configuration, lumbosacral motion, and timed bed mobility tasks.
Main Results:
- High intraclass correlation coefficients (ICCs) ranging from .70 to .97 were observed within groups.
- Overall ICCs across all participants were between .70 and .96, indicating strong reliability.
- Reliability remained consistent regardless of group membership and testing interval (1 day vs. 1 week).
Conclusions:
- Physical performance tests demonstrate excellent test-retest reliability and stability in elderly populations with diverse health conditions.
- These validated measures can be reliably applied in various settings and across a broad spectrum of elderly individuals.
- The findings support the use of these performance-based measures for consistent assessment in geriatric care and research.