Table 2.

Pearson correlation coefficient, P values, 95% CI, and mean bias for heart rate (HR) and HR variability parameters between Ring and Shimmer3 in 5-minute window time.

Parameters	Pearson correlation coefficient	P value	95% CI	Mean bias
HR	0.99341	<.001	−2.81 to 1.93	−0.44
RMSSDa	0.91502	<.001	−44.07 to 14.13	−14.97 ms
SDNNb	0.51772	<.001	−88.45 to 86.52	−0.96 ms
AVNNc	0.82486	<.001	−210.01 to 183.24	−13.39 ms
pNN50d	0.76024	<.001	−0.23 to 0.35	0.06
LFe band	0.42401	<.001	−1758.9 to 1806.12	23.61 ms2
HFf band	0.62734	<.001	−1423.92 to 1484.38	30.23 ms2
LF:HF ratio	0.35455	<.001	−2.53 to 2.31	−0.11

^aRMSSD: root mean square of successive differences between normal heartbeats.

^bSDNN: SD of normal beat-to-beat intervals.

^cAVNN: average of normal heartbeat intervals.

^dpNN50: percentage of successive beat-to-beat intervals that differ by more than 50 ms.

^eLF: low frequency.

^fHF: high frequency.