Table 2 Univariate and multivariate logistic regression analyses of HRV-related variables for prediction of poor outcome

 DC

0.819 (0.681–0.984)

− 2.13

0.033

 AVNN (ms)

0.995 (0.992–0.999)

− 2.52

0.012

 SDNN (ms)

0.990 (0.977–1.003)

− 1.53

0.127

 rMSSD (ms)

0.965 (0.929–1.003)

− 1.81

0.070

 pNN50(%)

0.985 (0.924–1.051)

− 0.45

0.654

 Triangular index

0.915 (0.834–1.004)

− 1.89

0.059

 Poincaré plot, SD1 (ms)

0.982 (0.951–1.015)

− 1.06

0.288

 Poincaré plot, SD2 (ms)

0.985 (0.968–1.001)

− 1.79

0.073

 ln total power (ms²)

0.626 (0.409–0.960)

− 2.15

0.032

 ln ULF power (ms²)

0.700 (0.469–1.043)

− 1.75

0.080

 ln VLF power (ms²)

0.373 (0.224–0.620)

− 3.80

0.001

 ln LF power (ms²)

0.598 (0.424–0.845)

− 2.92

0.003

 ln HF power (ms²)

0.802 (0.593–1.084)

− 1.44

0.151

 LF/HF

0.472 (0.304–0.733)

− 3.35

0.002

 Power law (β)

0.278 (0.074–1.038)

− 1.90

0.057

 DFA (α₁) (per 0.1 U)

0.635 (0.501–0.805)

− 3.76

0.001

 DFA (α₂) (per 0.1 U)

0.702 (0.556–0.886)

− 2.98

0.003

 ApEn (per 0.1 U)

0.930 (0.820–1.055)

− 1.13

0.260

 SampEn (per 0.1 U)

0.911 (0.787–1.054)

− 1.25

0.211

 MSE index

0.873 (0.811–0.941)

− 3.56

0.001

 Ln VLF power

0.436 (0.242–0.784)

− 2.77

0.006

 DFA (α₁) (per 0.1 U)

0.709 (0.523–0.956)

−  2.26

0.024

 MSE index

0.983 (0.888–1.088)

− 0.33

0.739