Table 2.

The 21 most important features along with their corresponding importance scores (IS), as well as the average percentage of classification accuracies (Avg. Accuracy) expressed as the mean ± standard deviation. By moving from top rows to the bottom, the feature set was grown by one feature at a time.

	Feature	Rounded IS	Avg. Accuracy (%)
1	Mean of absolute value of Y axis	$0.09$	$59.0\pm 5.4$
2	Median absolute deviation of SMV	$0.08$	$79.0\pm 3.5$
3	Mean of HR	$0.07$	$84.2\pm 4.8$
4	Mean absolute deviation of SMV	$0.05$	$85.1\pm 4.4$
5	Mean of absolute value of X axis	$0.04$	$85.1\pm 4.3$
6	Total power of Y axis	$0.04$	$86.2\pm 4.8$
7	Dominant frequency in Y axis	$0.04$	$88.0\pm 5.0$
8	Standard deviation of absolute value of Y axis	$0.04$	$87.9\pm 4.7$
9	Mean of absolute value of Z axis	$0.03$	$87.3\pm 4.8$
10	Total power of Z axis	$0.03$	$87.7\pm 4.7$
11	Mean of SMV	$0.03$	$87.9\pm 4.8$
12	Dominant frequency in X axis	$0.03$	$88.4\pm 4.8$
13	Spectral power of dominant frequency in Y axis	$0.03$	$88.3\pm 4.7$
14	Standard deviation of absolute value of X axis	$0.02$	$88.5\pm 4.6$
15	Total power of X axis	$0.02$	$88.5\pm 4.6$
16	Standard deviation of absolute value of Z axis	$0.02$	$88.5\pm 4.6$
17	Spectral power of Y axis in band (0–1] Hz	$0.02$	$88.8\pm 4.2$
18	Spectral power of X axis in band (0–1] Hz	$0.02$	$89.0\pm 4.3$
19	Spectral power corresponding to dominant frequency in X axis	$0.02$	$88.9\pm 4.2$
20	Spectral power corresponding to dominant frequency in Z axis	$0.01$	$89.1\pm 4.3$
21	Cross-correlation coefficient of X and Z axes	$0.01$	$89.4\pm 4.2$