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Table 1 Univariate selected parameters for discrimination between normoxia (NOR1), early hypoxia (HYP1), late hypoxia (HYP2), early reoxygenation (REOX1) and late reoxygenation (REOX2)

From: Quantification of compensatory processes of postnatal hypoxia in newborn piglets applying short-term nonlinear dynamics analysis

  

NOR1

vs.

HYP1

NOR1

vs.

HYP2

NOR1

vs.

REOX1

NOR1

vs.

REOX2

NOR1

HYP1

HYP2

REOX1

REOX2

method

parameter

p

p

P

p

Mean ± std

mean ± std

mean ± std

mean ± std

mean ± std

HRV

BBI_meanNN (ms)

*#

**#

**#

*#

358.02 ± 41.57

296.03 ± 37.77

279.05 ± 40.19

297.19 ± 28.09

295.89 ± 31.83

 

BBI_sdNN (ms)

*

n.s.

n.s.

n.s.

2.28 ± 1.20

4.49 ± 2.78

2.11 ± 0.69

2.77 ± 1.25

3.25 ± 3.72

 

BBI_LFn (a.u.)

n.s.

n.s.

n.s.

n.s.

0.41 ± 0.21

0.52 ± 0.19

0.37 ± 0.30

0.38 ± 0.14

0.39 ± 0.20

 

BBI_HFn (a.u.)

n.s.

n.s.

n.s.

n.s.

0.59 ± 0.21

0.48 ± 0.19

0.63 ± 0.30

0.62 ± 0.14

0.61 ± 0.20

 

BBI_LF/HF (a.u.)

n.s.

n.s.

n.s.

n.s.

0.93 ± 0.78

1.47 ± 1.17

1.10 ± 1.31

0.68 ± 0.35

0.78 ± 0.55

BPV

SYS_meanNN (mmHg)

n.s.

n.s.

n.s.

n.s.

93.95 ± 10.69

99.02 ± 23.89

100.81 ± 27.10

95.75 ± 16.78

90.89 ± 17.03

 

SYS_sdNN (mmHg)

*

n.s.

n.s.

n.s.

1.75 ± 0.86

3.28 ± 1.84

2.73 ± 1.09

2.10 ± 0.75

2.34 ± 1.93

SD

BBI_wpsum02 (a.u.,‰)

n.s.

**#

n.s.

n.s.

99.70 ± 0.03

97.10 ± 4.69

99.77 ± 0.03

99.49 ± 0.50

95.93 ± 9.37

 

SYS_wd_renyi1 (bit)

**#

**#

n.s.

n.s.

2.34 ± 0.24

2.92 ± 0.32

2.84 ± 0.26

2.53 ± 0.40

2.63 ± 0.41

 

DIA_wd_renyi1 (bit)

**#

*#

*#

*

2.82 ± 0.51

3.48 ± 0.23

3.43 ± 0.46

3.42 ± 0.22

3.39 ± 0.39

PPA

BBI_SD1 (ms)

n.s.

n.s.

n.s.

n.s.

0.99 ± 0.29

0.93 ± 0.26

0.97 ± 0.24

1.06 ± 0.42

1.23 ± 0.72

 

SYS_SD1 (ms)

**#

**#

*#

n.s.

0.70 ± 0.09

1.05 ± 0.21

1.03 ± 0.26

0.90 ± 0.16

0.91 ± 0.30

 

DIA_SD1 (ms)

**#

**#

n.s.

*

0.85 ± 0.13

1.42 ± 0.44

1.51 ± 0.60

1.10 ± 0.28

1.16 ± 0.30

SPPA

RESP_row8 (%)

n.s.

n.s.

**#

n.s.

12.40 ± 2.29

10.01 ± 4.50

8.86 ± 4.78

8.21 ± 2.15

11.73 ± 2.87

 

BBI_DIA_col5 (%)

*

n.s.

n.s.

n.s.

13.86 ± 3.24

18.82 ± 4.61

13.87 ± 4.57

13.13 ± 4.34

13.66 ± 3.74

JSD

BBI_SYS_JSD (a.u.,‰)

*

*

n.s.

n.s.

15.18 ± 4.48

8.66 ± 6.46

7.72 ± 4.79

13.34 ± 5.15

12.79 ± 4.92

 

BBI_RESP_JSD (a.u.,‰)

n.s.

n.s.

*

**#

9.40 ± 3.34

5.05 ± 4.43

5.86 ± 5.47

3.99 ± 3.93

3.23 ± 2.25

CCE

SYS_DIA_SI (a.u.)

**#

**#

n.s.

n.s.

0.06 ± 0.01

0.11 ± 0.05

0.13 ± 0.07

0.07 ± 0.02

0.09 ± 0.04

  1. (HRV - Heart Rate Variability; BPV - Blood Pressure Variability; SD - Symbolic Dynamics; JSD - Joint Symbolic Dynamics; (S)PPA - (Segmented) Poincaré Plot Analysis; CCE - Cross Conditional Entropy; mean - mean value; std - standard deviation; * - p < 0.05; ** - p < 0.01; n.s. - not significant; # - significant after Bonferroni-Holm adjustment.)