. 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 5.

Pearson and Spearman correlation coefficients for associations between non-linear HRV indices and parameters reflecting physical condition for all subjects (All), and for non diabetic (ND) and diabetic (D) subjects.

Measure Characterization	Specific Measures	Parameters associated with physical condition
		Phase Angle			Lean Body Mass			Intracellular Volume
		All	ND	D	All	ND	D	All	ND	D
Long term correlations	Detrended Fluctuation Analysis	−0.17^*	−0.18	−0.15	−0.21^§	−0.25^*	−0.20	−0.21^§	−0.25^*	−0.19
	Quadratic Detrended Fluctuation Analysis	−0.10	−0.13	−0.09	−0.18^*	−0.22^*	−0.15	−0.17^*	−0.21^*	−0.13
	Spectral Power Slope	−0.12	−0.18^*	−0.10	−0.04	−0.13	−0.07	−0.12	−0.18^*	−0.10
Complexity over different time scales	Multiscale Entropy Slope Approximate Entropy	0.25^§	0.31^§	0.16	0.12	0.15	0.26^*	0.21^§	0.24^*	0.26^*
Complexity over different time scales	Multiscale Entropy Slope Sample	0.23^§	0.29^§	0.15	0.17^*	0.18	0.32^§	0.24^§	0.25^*	0.31^§
Irregularity	Approximate Entropy (2,0.15) ^†	0.02	−0.06	0.09	0.09	0.11	0.07	0.08	0.11	0.07
Irregularity	Sample Entropy (2,0.15) ^†	0.02	−0.06	0.10	0.04	0.06	0.02	0.05	0.07	0.03

^§

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.