TABLE III.
List of Select Informative Features
| Physical State Classification | ||
|---|---|---|
| Feature Name | Time Delay (min) | p-value |
| Norm of 4th detail coefficient of Daubechies wavelet decomposition of ACC X-axis | 0 | ≤ 0.01 |
| Total energy response of BVP | 1 | ≤ 0.01 |
| Range for Magnitudes of ACC | 0 | ≤ 0.01 |
| Kurtosis of GSR | 3 | ≤ 0.01 |
| Standard Deviation of ACC / Std of GSR | 0 | ≤ 0.01 |
| Median of HR / Median of GSR | 0 | ≤ 0.01 |
| Std of ACC / Mean of ACC | 0 | ≤ 0.01 |
| Skewness of BVP | 1 | ≤ 0.01 |
| Minimum of HR | 0 | ≤ 0.01 |
| Mean of ST | 0 | ≤ 0.01 |
| p-values calculated using a two-sided t-test at α = 1% significance level | ||
| EE Estimation (Features with COSMED EE Measurements) | ||
| Feature Name | Time Delay (min) | Correlation |
| Std of magnitude of ACC (X-Y-Z) | 0 | 0.56 |
| Mean of logarithm of magnitude of ACC (X-Y-Z) | 0 | 0.55 |
| Maximum of ACC Z-axis | 0 | 0.55 |
| Zero cross of BVP | 0 | 0.49 |
| Minimum of high frequency of ST (0.15–0.4 Hz) | 0 | 0.49 |
| Root-mean-square energy of GSR | 4 | 0.48 |
| Maximum of power spectral density estimate of HR | 0 | 0.48 |
| 1st Quartile of HR | 0 | 0.48 |
| Norm of 1st detail coefficient of Daubechies wavelet decomposition of GSR | 0 | 0.48 |
| Summation of absolute differentiation of GSR | 12 | 0.34 |