Table 7.

Significant Heart Rate–Based Feature Differences from the Last 4 Minutes of the Initial Rest Period

Features	Math Test		Book Test		Cold Test
	t-Stat	p-Value	t-Stat	p-Value	t-Stat	p-Value
Mean heart rate (HR)	−13.230	<0.001	5.970	<0.001	−1.740	0.084
standard deviation HR	−1.270	0.204	−1.530	0.129	−1.710	0.090
Median HR	−13.060	<0.001	6.080	<0.001	−1.620	0.107
Max HR	−14.771	<0.001	3.194	0.002	−2.306	0.022
Min HR	−13.984	<0.001	8.171	<0.001	−0.757	0.450
20th percentile heart-rate	−11.640	<0.001	6.240	<0.001	−1.160	0.249
80th percentile heart-rate	−12.810	<0.001	5.030	<0.001	−2.040	0.044
Mean R-R interval	13.920	<0.001	−6.380	<0.001	2.110	0.037
standard deviation R-R interval	0.350	0.725	−2.440	0.015	−0.790	0.428
Median R-R interval	14.150	<0.001	−6.250	<0.001	1.970	0.052
Max R-R interval	6.760	<0.001	−4.960	<0.001	1.130	0.262
Min R-R interval	8.730	<0.001	−1.760	0.080	2.460	0.015
20th percentile R-R interval	13.440	<0.001	−4.420	<0.001	2.410	0.017
80th percentile R-R interval	11.160	<0.001	−6.430	<0.001	1.210	0.228
RMSSD	0.420	0.676	−2.670	0.008	−1.200	0.231

Significant scores (p < 0.05) are shown in bold.