Table 2.

Total variance explained and coefficients of each principal component (PC) for the cardiac variables derived for both pulse oximetry and ECG data

	PulseOx PCA			ECG PCA
	PC 1	PC 2	PC 3	PC 1	PC 2	PC 3
variance explained (%)	67.96	23.58	8.45	64.40	28.44	7.16
mean HR	−0.48	0.85	0.20	−0.39	0.90	0.18
LF‐HRV	0.60	0.49	−0.63	0.63	0.41	−0.66
HF‐HRV	0.64	0.19	0.75	0.67	0.15	0.73

These physiological recordings were used to derive mean HR, low‐frequency HRV (LF‐HRV) and high‐frequency HRV (HF‐HRV).