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The validity and reliability of the GAITRite system's measurements: A preliminary evaluation
A L McDonough1, M Batavia, F C Chen
1Department of Physical Therapy, New York University, New York, NY, USA. andrew.mcdonough@nyu.edu
Objective:
To compare the concurrent validity and reliability of the GAITRite computerized gait analysis system with validated paper-and-pencil and video-based methods.
Design:
Within-groups, repeated-measures design.
Setting:
Research laboratory in a physical therapy education program.
Participant:
One healthy woman, age 27 years.
Interventions:
A subject walked across the walkway of the GAITRite system at various walking rates and degrees of step symmetry for 2 of the 3 analyses. Paper placed over the walkway enabled concurrent paper-and-pencil analysis. The subject was concurrently videotaped from the side. For the other analysis, a stride simulator with known step and stride lengths was applied to the walkway to simulate 2 steps and 1 stride.
Main Outcome Measures:
Cadence, walking speed, right and left step and stride lengths, and right and left step times.
Results:
Excellent paper-and-pencil and GAITRite correlations (intraclass correlation coefficient [ICC] > 95) for spatial measures and excellent video-based and GAITRite correlations (ICC > 93) for temporal measures were found. GAITRite measures of step lengths and times were reliable in both walkway center and left-of-center measurements.
Conclusions:
Based on this data, GAITRite is a valid and reliable tool for measuring selected spatial and temporal parameters of gait.