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- Title
Measurement Structure of the Wolf Motor Function Test: Implications for Motor Control Theory.
- Authors
Woodbury, Michelle; Velozo, Craig A.; Thompson, Paul A.; Light, Kathye; Uswatte, Gitendra; Taub, Edward; Winstein, Carolee J.; Morris, David; Blanton, Sarah; Nichols-Larsen, Deborah S.; Wolf, Steven L.
- Abstract
Background. Tools chosen to measure poststroke upper-extremity rehabilitation outcomes must match contemporary theoretical expectations of motor deficit and recovery because an assessment’s theoretical underpinning forms the conceptual basis for interpreting its score. Objective. The purpose of this study was to investigate the theoretical framework of the Wolf Motor Function Test (WMFT) by (1) determining whether all items measured a single underlying trait and (2) examining the congruency between the hypothesized and the empirically determined item difficulty orders. Methods. Confirmatory factor analysis (CFA) and Rasch analysis were applied to existing WMFT Functional Ability Rating Scale data from 189 participants in the EXCITE (Extremity Constraint-Induced Therapy Evaluation) trial. Fit of a 1-factor CFA model (all items) was compared with the fit of a 2-factor CFA model (factors defined according to item object-grasp requirements) with fit indices, model comparison test, and interfactor correlations. Results. One item was missing sufficient data and therefore removed from analysis. CFA fit indices and the model-comparison test suggested that both models fit equally well. The 2-factor model yielded a strong interfactor correlation, and 13 of 14 items fit the Rasch model. The Rasch item difficulty order was consistent with the hypothesized item difficulty order. Conclusion. The results suggest that WMFT items measure a single construct. Furthermore, the results depict an item difficulty hierarchy that may advance the theoretical discussion of the person ability versus task difficulty interaction during stroke recovery.
- Subjects
FLORIDA; CEREBROVASCULAR disease; MOTOR ability; ANALYSIS of variance; CHI-squared test; CLINICAL trials; CONCEPTUAL structures; STATISTICAL correlation; FACTOR analysis; MEDICAL needs assessment; NURSING assessment; INDUSTRIAL psychology; RESEARCH funding; SCALE analysis (Psychology); STATISTICS; THEORY; DATA analysis; ACTIVITIES of daily living; SCALE items; SECONDARY analysis; CONSTRAINT-induced movement therapy; PHYSICAL therapy
- Publication
Neurorehabilitation & Neural Repair, 2010, Vol 24, Issue 9, p791
- ISSN
1545-9683
- Publication type
Article
- DOI
10.1177/1545968310370749