
OR (95% CI)

P value


All variable

Age

1.026 (0.987–1.066)

0.200

Age greater than 56

0.363 (0.079–1.674)

0.194

Systolic blood pressure

0.989 (0.972–1.006)

0.201

Heart rate

1.021 (0.997–1.044)

0.085

Glasgow Coma Scale

0.819 (0.699–0.960)

0.014

avHR

1.002 (0.973–1.031)

0.916

NN50

0.996 (0.958–1.036)

0.840

pNN50

1.043 (0.903–1.204)

0.570

LF

1.000 (0.999–1.002)

0.328

HF

0.999 (0.999–1.000)

0.224

LF norm

0.817 (0.574–1.162)

0.261

HF norm

0.842 (0.590–1.199)

0.340

LF/HF

1.000 (0.998–1.002)

0.837

Approximate entropy

1.866 (0.060–58.263)

0.723

Sample entropy

0.364 (0.056–2.366)

0.290

DFA1

10.157 (1.621–63.659)

0.013

DFA2

3.758 (0.653–21.629)

0.138

Variables after backward Wald selection

Glasgow Coma Scale

0.756 (0.660–0.864)

< 0.001

DFAα1

3.932 (1.256–12.314)

0.019

DFAα2

5.200 (1.060–25.504)

0.042

 OR odds ratio, CI confidence interval, avHR mean of the instantaneous heart rate in electrocardiograms, NN50 number of consecutive RR intervals differing by more than 50 ms in electrocardiograms, pNN50 percentage of consecutive RR intervals differing by more than 50 ms in electrocardiograms, LF low frequency power in electrocardiograms, HF high frequency power in electrocardiograms, norm normalised, LF/HF ratio of LF power to HF power in electrocardiograms, TP total power derived from variance of all RR intervals in electrocardiograms, DFA detrended fluctuation analysis