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Evaluation of the Functional Mobility Assessment Through Rasch Analysis

Published:December 03, 2019DOI:https://doi.org/10.1016/j.apmr.2019.09.021

      Abstract

      Objective

      To determine the effectiveness of the Functional Mobility Assessment (FMA) when measuring an individual’s satisfaction with functional mobility.

      Design

      Secondary analysis of cross-sectional self-report data.

      Setting

      Assistive technology center within an academic medical center in the Midwestern United States.

      Participants

      Individuals with a disability that use or plan to use a mobility device (N=871).

      Interventions

      Not applicable.

      Main Outcome Measures

      FMA.

      Results

      All FMA items (10/10) contributed to a single unidimensional construct with good to strong fit to a unidimensional confirmatory factor model. Rasch analysis revealed that the rating scale, majority of persons (>90%), and all items fit the Rasch measurement model. The FMA demonstrated adequate reliability (person reliability=0.85) and separated persons into 3 strata: those with high, medium, and low satisfaction with functional mobility.

      Conclusions

      The FMA is an appropriate measure for use in research and clinical settings to quantify satisfaction with functional mobility among mobility device users.

      List of abbreviations:

      CFA (confirmatory factor analysis), FMA (Functional Mobility Assessment), PROM (patient-reported outcome measure), RMSEA (root mean square error of approximation), SRMR (standardized root mean square residual)

      Keywords

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