Table 1.

Performance for different skin tones in the still scenario.

	SDNN		RMSSD
	mae ± sd (ms)	Pearson’s correlation coefficient	mae ± sd (ms)	Pearson’s correlation coefficient
Light skin tone
Peak NC-VT	$3\pm 3$	0.96*	$8\pm 8$	0.80*
CDM	$6\pm 5$	0.89*	$13\pm 9$	0.85*
HRVCam	$3\pm 4$	0.92*	$6\pm 7$	0.85*
Dark skin tone
Peak NC-VT	$3\pm 3$	0.98*	$7\pm 7$	0.92*
CDM	$4\pm 3$	0.96*	$8\pm 10$	0.83*
HRVCam	$2\pm 1$	0.99*	$3\pm 3$	0.98*

^*$p\text{-value}<0.01$