Table 6.

Significant Heart Rate–Based Feature Differences from the Initial Rest Period of 10 Minutes

Features	Math Test		Book Test		Cold Test
	t-Stat	p-Value	t-Stat	p-Value	t-Stat	p-Value
Mean heart rate (HR)	−14.170	<0.001	7.490	<0.001	−1.420	0.159
Standard deviation HR	−0.560	0.579	−0.810	0.419	−1.300	0.198
Median HR	−13.970	<0.001	7.670	<0.001	−1.240	0.217
Max HR	−13.261	<0.001	3.646	<0.001	−1.913	0.059
Min HR	−10.786	<0.001	7.709	<0.001	−0.570	0.570
20th percentile HR	−12.540	<0.001	7.710	<0.001	−0.930	0.355
80th percentile HR	−13.750	<0.001	6.380	<0.001	−1.770	0.080
Mean R-R interval	7.020	<0.001	−5.830	<0.001	−0.770	0.443
Standard deviation R-R interval	0.220	0.830	−0.350	0.726	1.140	0.254
Median R-R interval	6.870	<0.001	−6.760	<0.001	−0.380	0.704
Max R-R interval	6.790	<0.001	−6.740	<0.001	0.200	0.843
Min R-R interval	2.650	0.009	0.180	0.858	0.680	0.496
20th percentile R-R interval	3.630	<0.001	−3.270	0.001	−1.780	0.076
80th percentile R-R interval	10.680	<0.001	−7.860	<0.001	0.180	0.856
RMSSD	−0.470	0.637	−0.780	0.436	0.300	0.765

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