Dimensionality and Construct Validity of the Fugl-Meyer Assessment of the Upper Extremity

Michelle L. Woodbury*, Craig A. Velozo, Lorie G. Richards, Pamela W. Duncan, Stephanie Studenski, Sue Min Lai

*Corresponding author for this work

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66 Citations (Scopus)

Abstract

Woodbury ML, Velozo CA, Richards LG, Duncan PW, Studenski S, Lai S-M. Dimensionality and construct validity of the Fugl-Meyer Assessment of the upper extremity. Objective: To investigate the dimensionality and construct validity of the Fugl-Meyer Assessment of the upper extremity by using Rasch analysis. Design: Secondary analysis of pooled data from 2 existing datasets: a randomized therapeutic exercise clinical trial and a cohort longitudinal study of stroke recovery. Setting: University research center. Participants: A total of 512 subjects, ages 69.8±11.1 years, who were 0 to 145 days poststroke. Interventions: Not applicable. Main Outcome Measures: Dimensionality was examined with principal components analysis and Rasch item-fit statistics. The Rasch-derived item hierarchy was examined for consistency with the expected course of poststroke upper-extremity recovery suggested by the reflex-hierarchical conceptual model underlying the assessment. Results: Factor loadings and item infit statistics suggested that the 3 reflex items were empirically disconnected from other assessment items. The reflex items were removed. The modified 30-item assessment showed a unidimensional structure. The Rasch-item-difficulty order was not consistent with the expected item order. Conclusions: The items testing resting-state reflexes may threaten the assessment's dimensionality. With reflex items removed, the assessment is a unidimensional measure of volitional movement. The Rasch-generated item-difficulty order challenges the hierarchical structure implied by the instrument's underlying conceptual framework.

Original languageEnglish
Pages (from-to)715-723
Number of pages9
JournalArchives of Physical Medicine and Rehabilitation
Volume88
Issue number6
DOIs
Publication statusPublished - Jun 2007
Externally publishedYes

Keywords

  • Rehabilitation
  • Research design
  • Stroke

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    Woodbury, M. L., Velozo, C. A., Richards, L. G., Duncan, P. W., Studenski, S., & Lai, S. M. (2007). Dimensionality and Construct Validity of the Fugl-Meyer Assessment of the Upper Extremity. Archives of Physical Medicine and Rehabilitation, 88(6), 715-723. https://doi.org/10.1016/j.apmr.2007.02.036