Table 2. List of features extracted from the vertical ground reaction force data.
| Features | Description |
|---|---|
| Coefficient of Variation (CV) of swing time | CVswing = (mean/standard deviation) * 100 |
| Coefficient of Variation (CV) of stride time | CVstride = (mean/standard deviation) * 100 |
| Mean Center of Pressure (CoP) of x-coordinate (Newton) |
where n is the number of sensors, six is x-coordinate of that sensor, and f(six) is the VGRF value of sensor i in N |
| Standard deviation of Center of Pressure (CoP) of x-coordinate (Newton) |
where n is the number of sensors, six is x-coordinate of that sensor, and f(six) is the VGRF value of sensor i in N |
| Mean Center of Pressure (CoP) of y-coordinate (Newton) |
where n is the number of sensors, siy is y-coordinate of that sensor and f(siy) is the VGRF value of sensor i in N |
| Standard deviation of Center of Pressure (CoP) of y-coordinate (Newton) |
where n is the number of sensors, sjy is y-coordinate of that sensor, and f(siy) is the VGRF value of sensor i in N |
| Mean peak force at heel strike (Newton) | Mean of maximum value of VGRF force of sensors beneath heel for first five sample points in stance phase |
| Mean peak force at toe strike (Newton) | Mean of maximum value of VGRF force of sensors beneath toe for last five sample points in stance phase |
| Standard deviation of peak forces at heel strike (Newton) | STD of maximum value of VGRF force of sensors beneath heel for first five sample points in stance phase |
| Standard deviation of peak forces at toe strike (Newton) | STD of maximum value of VGRF force of sensors beneath heel for first five sample points in stance phase |
| Mean kurtosis (Second) | Mean kurtosis of the gait cycle duration |
| Mean skewness (Second) | Mean skewness of the gait cycle duration |
| Mean Peak power of VGRF signal (Decibel) | Mean maximum power from Power Spectral Density analysis of a VGRF gait cycle |