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. Author manuscript; available in PMC: 2020 Aug 21.

Published in final edited form as: ACM Trans Comput Healthc. 2020 Apr;1(2):8. doi: 10.1145/3361562

Table 2.

Pearson’s Correlation of Features Computed by Zephyr HXM and Polar H7, with the Lab Benchmark—Biopac

Features	Zephyr HXM		Polar H7
Features	r-Coefficient	p-Value	r-Coefficient	p-Value
Mean of heart rate (HR)	0.778	<0.001	0.917	<0.001
Standard deviation HR	0.361	0.077	0.809	<0.001
Median HR	0.759	<0.001	0.794	<0.001
20th percentile HR	0.831	<0.001	0.838	<0.001
80th percentile HR	0.704	<0.001	0.951	<0.001
Mean R-R interval	0.768	<0.001	0.999	<0.001
Standard deviation R-R	0.622	0.001	0.951	<0.001
Median R-R	0.757	<0.001	0.988	<0.001
Max of R-R	0.533	0.006	0.663	0.002
Min of R-R	0.595	0.002	0.855	<0.001
20th percentile R-R	0.661	0.000	0.995	<0.001
80th percentile R-R	0.966	<0.001	0.997	<0.001