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Updated: Apr 19, 2026

Quantitative Static and Dynamic Assessment of Balance Control in Stroke Patients
Published on: May 17, 2020
Investigating the validity of the environmental framework underlying the original and modified Dynamic Gait Index
Anne Shumway-Cook1, Patricia Noritake Matsuda2, Catherine Taylor3
1A. Shumway-Cook, PT, PhD, FAPTA, Department of Rehabilitation Medicine, Division of Physical Therapy, University of Washington, 1959 NE Pacific St, Box 356490, Seattle, WA 98195 (USA). ashumway@uw.edu.
Background:
The modified Dynamic Gait Index (mDGI), developed from a person-environment model of mobility disability, measures mobility function relative to specific environmental demands. The framework for interpreting mDGI scores relative to specific environmental dimensions has not been investigated.
Objective:
The aim of this study was to examine the person-environmental model underlying the development and interpretation of mDGI scores.
Design:
This was a cross-sectional, descriptive study.
Methods:
There were 794 participants in the study, including 140 controls. Out of the total study population, 239 had sustained a stroke, 140 had vestibular dysfunction, 100 had sustained a traumatic brain injury, 91 had gait abnormality, and 84 had Parkinson disease. Exploratory factor analysis was used to investigate whether mDGI scores supported the 4 environmental dimensions.
Results:
Factor analysis showed that, with some exceptions, tasks loaded on 4 underlying factors, partially supporting the underlying environmental model.
Limitations:
Limitations of this study included the uneven sample sizes in the 6 groups.
Conclusions:
Support for the environmental framework underlying the mDGI extends its usefulness as a clinical measure of functional mobility by providing a rationale for interpretation of scores that can be used to direct treatment and infer change in mobility function.
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