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Related Experiment Videos

Late Life Function and Disability Instrument: II. Development and evaluation of the function component.

Stephen M Haley1, Alan M Jette, Wendy J Coster

  • 1Roybal Center for Enhancement of Late-Life Function, Sargent College of Health and Rehabilitation Sciences, Boston University, Massachusetts 02215, USA. smhaley@bu.edu

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|March 23, 2002
PubMed
Summary

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A new instrument, the Late-Life Function and Disability Instrument, effectively measures physical functioning in older adults. It shows high reliability and validity for assessing upper and lower extremity tasks.

Area of Science:

  • Gerontology
  • Rehabilitation Science
  • Health Measurement

Background:

  • Self-reported physical functioning is crucial for older adults.
  • Existing measures lack sensitivity, reproducibility, and comprehensive assessment of upper/lower extremity function.

Purpose of the Study:

  • To develop and evaluate a new instrument to assess physical functioning in older adults.
  • To address limitations of current self-reported physical functioning measures.

Main Methods:

  • Developed a 48-item questionnaire based on Nagi's disablement model.
  • Utilized factor analysis and Rasch techniques for instrument construction.
  • Evaluated validity and test-retest reliability in 150 diverse older adults (60+ years).

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Main Results:

  • A 32-item instrument with three dimensions: upper extremity, basic lower extremity, and advanced lower extremity functions.
  • Validity supported by expected differences in functional limitation groups.
  • High test-retest reliability (ICC = .91–.98) over 1–3 weeks.

Conclusions:

  • The Late-Life Function and Disability Instrument is a promising tool for assessing physical functioning.
  • It captures upper and lower extremity functioning across diverse daily tasks and ability levels.