Table 3 Descriptive statistics of nonlinear HRV features during holidays and during university examination

Mean

SD

Med.

25 ^th

75 ^th

Mean

SD

Med.

25 ^th

75 ^th

SD1

0.024

0.01

0.023

0.016

0.03

0.024

0.011

0.024

0.012

0.033

SD2

0.078

0.024

0.079

0.061

0.094

0.048

0.022

0.046

0.031

0.057

D ₂

2.828

1.09

3.179

2.244

3.544

1.649

1.282

1.494

0.468

2.574

En(0.2)

1.095

0.125

1.102

1.02

1.192

0.99

0.24

0.932

0.841

1.177

En(r _max )

1.122

0.101

1.113

1.057

1.217

1.086

0.171

1.017

0.952

1.217

En(r _chon )

1.112

0.111

1.106

1.052

1.217

0.983

0.243

0.951

0.842

1.177

α ₁

1.413

0.16

1.438

1.283

1.51

1.054

0.446

1.043

0.69

1.447

α ₂

0.781

0.182

0.715

0.644

0.953

0.759

0.135

0.766

0.678

0.851

l _max

286.7

111.2

282

178

384

213.4

136.5

179

86

282

l _mean

11.09

2.478

10.43

9.518

12.68

14.88

6.771

13.32

11.10

16.92

REC

33.46

6.27

32.57

29.55

37.59

42.24

12.05

43.25

36.11

49.02

DET

98.61

0.86

98.78

98.31

99.19

98.75

1.28

99.25

98.14

99.63

ShEn

3.171

0.233

3.139

3.043

3.362

3.421

0.397

3.417

3.21

3.642