Table 3.

Using sensitive PPG features to fit the improved HRV parameters.

		LFru	HFr
Fitting parameters	Intercept	−250.5855	25.7447
	LF	−0.2786	1.2110
	Std(Hb/Ha)	2.5954e+03	0
	LF/HF	0	−28.7423
	Rmssd(Ha)	0	0
	Rmssd(Hb/Ha)	0	0
	Std(T)	6.0328	1.1627
Model evaluation	F-value	47.6866	452.363
	p-value	2.9264e−20	1.5981e−64

At p < 0.05, the standard F-value was F_(122,3) = 2.6789.

LF, low-frequency power of PRV; LF, high-frequency power of PRV; LF/HF, ratio of LF to HF; T, time span of the pulse; Ha, height of a point in APG (second derivative or acceleration of PPG); Hb, height of b point in APG.