. Author manuscript; available in PMC: 2016 Jul 4.

Published in final edited form as: Blood Purif. 2015 Jul 4;40(1):99–108. doi: 10.1159/000381665

Table 4.

Pearson and Spearman correlation coefficients for associations between non-linear HRV indices and age and ESRD vintage for all subjects (All), and for non diabetic (ND) and diabetic (D) subjects.

Measure Characterization	Specific Measures	Age			ESRD Vintage
Measure Characterization	Specific Measures	All	ND	D	All	ND	D
Long term correlations	Detrended Fluctuation Analysis	0.12	0.16	0.02	0.15	0.25^*	0.03
	Quadratic Detrended Fluctuation Analysis	0.04	0.10	−0.05	0.13	.23^*	−0.01
	Spectral Power Slope	0.37^§	0.39^§	0.13	−0.01	0.10	−0.07
Complexity over different time scales	Multiscale Entropy Slope Approximate Entropy	−0.34^§	−0.34^§	−0.10	0.11	−0.03	0.24^*
Complexity over different time scales	Multiscale Entropy Slope Sample Entropy	−0.29^§	−0.34^§	0.00	0.09	−0.05	0.22^*
Irregularity	Approximate Entropy (2,0.15) ^†	0.16^*	0.18^*	0.19	−0.07	−0.04	−0.13
Irregularity	Sample Entropy (2,0.15) ^†	0.09	0.13	0.09	−0.09	−0.07	−0.13

^§

p-value<0.01 (dark grey);

p-value ≤0.05 (light grey)

^†

Associations for these HRV parameters summarized with Spearman correlation coefficients. All other associations summarized with Pearson correlation coefficients.