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Table 4 Comparison of nonlinear HRV features during holidays and during university examination

From: Nonlinear Heart Rate Variability features for real-life stress detection. Case study: students under stress due to university examination

Meas.

Mean

SD

Med.

25th

75th

p-value

SD1

0.0001

0.0148

-0.0016

-0.0088

0.0116

0.79

SD2

-0.0298

0.0269

-0.0272

-0.0493

-0.0162

<0.01

D 2

-1.1791

1.4455

-0.9694

-2.7376

-0.1371

<0.01

En(0.2)

-0.1056

0.2321

-0.1272

-0.2517

0.0448

<0.01

En(r max )

-0.0360

0.1629

-0.0758

-0.1441

0.0865

0.11

En(r chon )

-0.1294

0.2315

-0.1385

-0.2623

0.0069

<0.01

α 1

-0.3594

0.4525

-0.3774

-0.7115

0.0431

<0.01

α 2

-0.0220

0.2250

-0.0224

-0.1828

0.0999

0.49

l max

-73.3

168.5

-93.5

-171.0

39.0

<0.01

l mean

3.7916

7.6832

3.0725

-0.7296

5.7562

<0.01

REC

8.78

14.30

8.93

-1.26

17.28

<0.01

DET

0.14

1.50

0.47

-0.73

0.84

0.29

ShEn

0.2505

0.4907

0.3008

-0.0737

0.4896

<0.01