D. Data analysis
Mean temporal-spatial gait parameters, including gait
velocity, stride length and step length of each subject across 3
trials were calculated. The stride-to-stride standard deviations
(SD) in the above parameters were also analyzed as the gait
variability. These parameters were all normalized by subjects’
leg length. (Unit of normalized gait velocity and its variability
are ‘1/s’; normalized stride and step length along with their
variability have no units.)