Table 1.

Pearson correlation factor ρ and p-values of non-linear indices and RR obtained from simulation study.

	D2(max)		SampEn		ApEnmax
ρ	0.959 ± 0.068		0.947 ± 0.1		0.949 ± 0.074
p-value	0.0002 ± 0.0015		0.0004 ± 0.0044		0.0003 ± 0.0022
Median ± IQR	4.26 ± 0.76		0.72 ± 0.30		0.98 ± 0.26
Regression formulas	Linear			Parabolic
	D2(max)C1	SampEnC1	ApEnC1	D2(max)C2	SampEnC2	ApEnC2
R2	0.919±0.129	0.896±0.186	0.902±0.139	0.923±0.129	0.896±0.179	0.910±0.125
ρ sub-spe (× 10−05)	0.013±0.20	0.016±0.21	−0.0051±0.20	−0.016±0.20	0.011±0.20	0.01±0.20
p-value sub−spe	1±0	1±0	1±0	1±0	1±0	1±0
Median ±IQR	3.88±0.07	0.59±0.02	0.85±0.04	3.85±0.02	0.59±0.01	0.84±0.03
$R_{\text{Median}}^2$	0.997	0.988	0.970	0.999	0.990	0.982
ρMedian (× 10−05)	−0.787	−0.109	−0.051	0.661	0.232	0.061
p-value Median	1	1	1	1	1	1
ξ Correction factor	2.39	0.93	0.75	0.39	0.84	0.54
Median ± IQR	3.88±0.07	0.59±0.02	0.85±0.05	3.85±0.02	0.59±0.01	0.84±0.03
2 Hz Interpolation	D2(max)		SampEn		ApEnmax
ρI2	−0.473 ± 1.41		−0.39 ± 1.09		−0.29 ± 0.77
p-value I2	0.0005 ± 0.044		0.008 ± 0.19		0.068 ± 0.37
Median ± IQR	3.85 ± 0.01		0.59 ± 0.002		0.83 ± 0.006

Linear and parabolic dependence of non-linear indices on RR was evaluated. Coefficient of determination (R²) as well as Pearson correlation factor and p-values (considering subject-specific and median correction) and ξ correction factor are presented for both regressions. Pearson correlation factor ρ and p-values of non-linear indices and RR obtained interpolating the simulated RR time series at 2 Hz. Data are given as median ± interquartile range.