Table 1.

Comparison values when PRV and HRV indices are compared with each other. Here, PC stands for the Pearson correlation coefficient (with the P values), m and b represent the coefficients for the linear regression on HRV (PRV) with the corresponding mean error (err), R² is the coefficient of determination, and bias, SD, and BAR values are the results of the Bland-Altman analysis. The definitions of the HRV indices were introduced earlier.

	PC	P	lin. m	lin. b	lin. err (MSE)	lin. R2	Bias	SD	BAR
HR (beat/min)	1	<10−23	1.00	−0.12	0.011	1	0.032	0.110	<0.001
Mean RR(ms)	1	<10−23	1.00	−0.02	0	1	−0.002	0.009	<0.001
RMSSD (ms)	0.996	<10−23	1.00	2.53	3.15	0.992	2.464	1.793	0.106
ln(RMSSD)	0.973	<10−23	0.87	0.528	0.017	0.947	0.103	0.153	0.089
SDNN (ms)	0.999	<10−23	1.01	1.06	0.582	0.998	1.271	0.776	0.035
pNN50 (%)	0.993	<10−23	1.07	1.67	4.399	0.987	2.673	2.432	0.306
TP (total power, ms2)	0.998	<10−23	1.04	16.52	1439.3	0.997	50.15	46.05	0.100
LP (lf power, ms2)	0.999	<10−23	1.04	−1.14	86.63	0.999	15.96	16.03	0.089
HP (hf power, ms2)	0.995	<10−23	1.06	18.51	783.9	0.991	33.87	33.18	0.246
LP + HP	0.998	<10−23	1.06	13.14	1124.4	0.996	49.83	45.21	0.144
LP/HP	0.941	<10−23	0.68	0.341	0.326	0.885	−0.529	0.937	0.736