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Table 3 Descriptive statistics 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. Rest session Stress session
  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