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Table 3 Electrocardiographic characteristics of the patients, after feature selection, that were used to construct SVM predictive models

From: Usefulness of the heart-rate variability complex for predicting cardiac mortality after acute myocardial infarction

Variables

Survivals (n = 196)

Cardiac deaths (n = 12)

P value

Standard deviation of all normal-to-normal intervals

96.22 ± 27.86

64.52 ± 14.65

<0.001

Standard deviation of average normal-to-normal intervals

83.66 ± 26.65

58.47 ± 15.68

0.001

Average standard deviation of all normal-to-normal intervals

43.40 ± 13.67

25.74 ± 6.84

<0.001

Mean normal-to-normal intervals

893.54 ± 115.46

826.85 ± 84.21

0.051

Triangle index (number%)

27.48 ± 8.81

16.80 ± 4.20

<0.001

Heart rate deceleration capacity

6.31 ± 1.91

4.21 ± 1.44

<0.001

Heart rate acceleration capacity

-6.27 ± 1.98

-4.12 ± 1.42

<0.001

Mean heart rates per hour (number)

68.36 ± 9.00

73.50 ± 7.70

0.054

  1. Data are ms unless otherwise specified.