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Psychometric Evaluation of the Improved Work-Disability Functional Assessment Battery
Mark Meterko1, Molly Marino2, Pengsheng Ni2
1VHA Office of Reporting, Analytics, Performance, Improvement and Deployment (RAPID), Washington, DC; Boston University School of Public Health, Department of Health Law Policy and Management, Boston, MA.
Archives of Physical Medicine and Rehabilitation
|December 23, 2018
Summary
The Work Disability Functional Assessment Battery (WD-FAB 2.0) demonstrates strong reliability and validity for assessing physical and mental health function. These findings support its use beyond the Social Security Administration for work disability evaluations.
Area of Science:
- Rehabilitation medicine
- Psychometrics
- Occupational health
Background:
- Assessing work disability requires reliable and valid functional measures.
- The Work Disability Functional Assessment Battery (WD-FAB) was improved to enhance its utility.
- Understanding the psychometric properties of WD-FAB 2.0 is crucial for its application.
Purpose of the Study:
- To evaluate the psychometric properties, specifically reliability and construct validity, of the improved Work Disability Functional Assessment Battery (WD-FAB 2.0).
Main Methods:
- A longitudinal study design was employed with three distinct samples of working-age adults (N=1006).
- Participants included individuals unable to work due to physical or mental health conditions, and a general working-age sample.
- Test-retest reliability was assessed using intraclass correlation coefficients (ICC), and construct validity was examined through correlational analyses with legacy measures.
Main Results:
- High test-retest reliability (ICCs ranging from 0.62 to 0.86) was observed across physical and mental health function scales in diverse samples.
- Convergent and divergent validity were supported by expected correlations between WD-FAB 2.0 scales and legacy measures.
- Standard error of the mean (SEM) and minimal detectable change (MDC90) indicated good precision and sensitivity for the scales.
Conclusions:
- The WD-FAB 2.0 exhibits substantial reliability and construct validity across different adult populations.
- These findings support the broader applicability of the WD-FAB 2.0 for assessing work-related physical and mental health function in various settings.
- The improved battery is a valuable tool for consistent and accurate work disability evaluations.
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