Reliability,internal consistency,and concurrent validity of a modified version of the dynamic gait index in people with vestibular disorders |
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| Affiliation: | 1. The BioRobotics Institute, Scuola Superiore Sant Anna, viale R. Piaggio 34, 56026 Pontedera (PI), Italy;2. Department of Mechanical Engineering, Columbia University, New York, NY, USA;3. MARE Lab, IRCSS Don Carlo Gnocchi Foundation, Firenze, Italy;4. Bertarelli Foundation Chair in Translational NeuroEngineering, Center for Neuroprosthetics and Institute of Bioengineering, School of Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland;1. Institute for Neuroimmunology and Clinical MS Research (inims) and Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;2. Department of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;1. Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea;2. Department of Otolaryngology–Head and Neck Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea |
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| Abstract: | BackgroundPeople with vestibular disorders often have abnormalities in gait and balance. The Dynamic Gait Index (DGI) is a relatively effective clinical gait measure that has been validated for use in patients with vestibular disorders. The modified version of the DGI (M-DGI) is based on the original DGI.Research questionThe objective of this study was to refine and test the clinical application of the M-DGI, and to investigate whether it is an effective indicator of dynamic gait in patients with vestibular disorders.MethodsA reliability and validity study. All raters reviewed the instructions and scoring criteria for each M-DGI item prior to the initial test. The raters simultaneously scored two M-DGI tasks for the 75 subjects, and the two tasks were completed with an interval of two hours in-between. Reliability of total M-DGI scores was assessed using intraclass correlation coefficients (2,1). Internal consistency of the M-DGI was evaluated using Cronbach’s alpha. Concurrent validity of the M-DGI with Dizziness Handicap Inventory (DHI) and Timed “Up & Go” Test (TUG) was assessed using Spearman’s rank order correlation coefficient.Results and SignificanceInterrater and intrarater reliability of the total M-DGI scores were reflected by ICCs of 0.99 and 0.97. Internal consistency of the M-DGI score was 0.9975. Spearman’s rank order correlation coefficient of the M-DGI score with the Dizziness Handicap Inventory (DHI) and the Timed “Up & Go” Test (TUG) was 0.72 and 0.65, respectively.The M-DGI demonstrates acceptable reliability, internal consistency, and concurrent validity for use as a clinical gait measurement for patients with vestibular disorders. |
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| Keywords: | Modified Dynamic gait index Vestibular disorders Gait Measurement |
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