Psychometric Evaluation of the Improved Work-Disability Functional Assessment Battery

Publication date: Available online 19 December 2018

Source: Archives of Physical Medicine and Rehabilitation

Author(s): Mark Meterko, Molly Marino, Pengsheng Ni, Elizabeth Marfeo, Christine M. McDonough, Alan Jette, Kara Peterik, Elizabeth Rasch, Diane E. Brandt, Leighton Chan

Objective

To assess psychometric properties of the improved Work Disability Functional Assessment Battery (WD-FAB 2.0).

Design

Longitudinal study

Setting

Community

Participants

Three samples of working-age (21-66) adults: (1) unable to work because of a physical condition (n=375); (2) unable to work because of a mental health condition (n=296); (3) general US working age sample (n=335)

Intervention

NA

Main Outcome Measures

All samples completed the WD-FAB 2.0; the second administration came 5 days after the first. Construct validity was examined by convergent and divergent correlational analysis using legacy measures. Test-retest reliability was assessed by intraclass correlation coefficients (ICC3,1). Standard error of measurement (SEM) and minimal detectable change (MDC90) were calculated to measure scale precision and sensitivity.

Results

Physical function ICCs ranged from 0.69 to 0.77 in the general sample, and 0.66 to 0.86 in the disability sample. Mental health function scales ICCs ranged from 0.62 to 0.73 in the general sample, and 0.74 to 0.76 in the disability sample. SEMs for all scales indicated good discrimination; those for the physical function scales were generally lower than those for the mental health scales. MDC90 values ranged from 3.41 to 10.55. Correlations between all WD-FAB 2.0 scales and legacy measures were in the expected direction.

Conclusions

The study provides substantial support for the reliability and construct validity of the WD-FAB 2.0 among three diverse samples. Although initially developed for use within the Social Security Administration, these results suggest that the WD-FAB 2.0 could be used for assessment and measurement of work-related physical and mental health function in other contexts as well.

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