Table 1.

Performance statistics of the different approaches. The bias, precision and performance index (PI) of SpO2, as well as the mean absolute pulse rate error and dropout rate, are used to evaluate the performance of the WMA, FFT and SPWVD approaches when subjects are in a resting position and in motion.

State	Approach	SpO2 bias (%)	SpO2 precision (%)	SpO2 PI (%)	Mean absolute pulse rate error (bpm)	Dropout rate (%)
Resting	WMA	0.19	0.34	100	1.25	0.0
	FFT	0.24	0.53	100	2.51	0.0
	SPWVD	0.21	0.41	100	1.35	0.0
Motion	WMA	-1.31	3.58	81	16.4	4.6
	FFT	-1.42	3.18	83	11.2	0.0
	SPWVD	-1.07	2.42	91	5.62	0.0