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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