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Objectives: To build a comprehensive item pool representing work-relevant physical functioning and to test the factor structure of the item pool. These developmental steps represent initial outcomes of a broader project to develop instruments for the assessment of function within the context of Social Security Administration (SSA) disability programs. Design: Comprehensive literature review; gap ... read moreanalysis; item generation with expert panel input; stakeholder interviews; cognitive interviews; cross-sectional survey administration; and exploratory and confirmatory factor analyses to assess item pool structure. Setting: In-person and semistructured interviews and Internet and telephone surveys. Participants: Sample of SSA claimants (n=1017) and a normative sample of adults from the U.S. general population (n=999) Interventions: Not applicable. Main Outcome Measure: Model fit statistics. Results: The final item pool consisted of 139 items. Within the claimant sample, 58.7% were white; 31.8% were black; 46.6% were women; and the mean age was 49.7 years. Initial factor analyses revealed a 4-factor solution, which included more items and allowed separate characterization of: (1) changing and maintaining body position, (2) whole body mobility, (3) upper body function, and (4) upper extremity fine motor. The final 4-factor model included 91 items. Confirmatory factor analyses for the 4-factor models for the claimant and the normative samples demonstrated very good fit. Fit statistics for claimant and normative samples, respectively, were: Comparative Fit Index=.93 and.98; Tucker-Lewis Index=.92 and.98; and root mean square error approximation=.05 and.04. Conclusions: The factor structure of the physical function item pool closely resembled the hypothesized content model. The 4 scales relevant to work activities offer promise for providing reliable information about claimant physical functioning relevant to work disability.read less
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- McDonough, Christine M., Alan M. Jette, Pengsheng Ni, Kara Bogusz, Elizabeth E. Marfeo, Diane E. Brandt, Leighton Chan, Mark Meterko, Stephen M. Haley, and Elizabeth K. Rasch. "Development of a Self-Report Physical Function Instrument for Disability Assessment: Item Pool Construction and Factor Analysis." Archives of Physical Medicine and Rehabilitation 94, no. 9 (September 2013): 1653-1660. doi:10.1016/j.apmr.2013.03.011.
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