. Author manuscript; available in PMC: 2013 Oct 1.

Published in final edited form as: Physiol Meas. 2012 Sep 4;33(10):1563–1583. doi: 10.1088/0967-3334/33/10/1563

Table 4.

Pearson correlation between the variability parameters and SDNN/RMSSD for the three HR sub-series and the defined groups. The number of total HR sub-series analyzed for each group is given in parentheses. Only significant correlations are reported.

5 min HR sub-series
	Entire population (46)	Group I (19)	Group II (20)	Group III (7)
SDNN	0.42^**
RMSSD	−0.33^*	−0.64^**	−0.74^***	−0.91^**
STV		−0.48^*
LTI	0.54^***
ApEn	−0.60^***	−0.77^***
SampEn	−0.51^***	−0.66^**

3 min HR sub-series
	Entire population (92)	Group I (41)	Group II (42)	Group III (9)
SDNN	0.41^***
RMSSD	−0.28^**	−0.66^***	−0.68^***	−0.89^**
Delta	0.29^**
STV		−0.46^**		−0.86^**
LTI	0.60^***	0.44^**	0.33^*	0.87^**
ApEn	−0.69^***	−0.74^***	−0.51^***
SampEn	−0.58^***	−0.65^***	−0.36^*

2 min HR sub-series
	Entire population (92)	Group I (49)	Group II (42)	Group III (9)
SDNN	0.37^***
RMSSD	−0.32^**	−0.55^***	−0.75^***	−0.94^***
Delta			−0.48^**
STV		−0.30^*	−0.45^**
LTI	0.54^***	0.42^**		0.88^**
ApEn	−0.69^***	−0.74^***	−0.55^***
SampEn	−0.65^***	−0.68^***	−0.48^**

^***

p < 0.001,

^**

p < 0.01,

p < 0.05.