Table 5.
Statistical significance of the extracted features.
| Feature | Preoperative Period [Mean ± SD] |
Immediately Postoperative Period [Mean ± SD] |
p-Value | Significant |
|---|---|---|---|---|
| Pulse Height | 0.908 ± 0.206 | 0.673 ± 0.489 | <0.0001 | Yes |
| Rise time | 0.219 ± 0.05 | 0.227 ± 0.046 | <0.0001 | Yes |
| Fall time | 0.700 ± 0.128 | 0.660 ± 0.115 | <0.0001 | Yes |
| Average heart rate | 66.32 ± 10.30 | 69.66 ± 10.28 | <0.0001 | Yes |
| AVNN | 0.928 ± 0.145 | 0.883 ± 0.130 | <0.0001 | Yes |
| SDNN | 0.041 ± 0.016 | 0.039 ± 0.019 | <0.0001 | Yes |
| rMSSD | 0.031 ± 0.016 | 0.032 ± 0.019 | 0.6798 | No |
| NN20 | 133.1 ± 61.65 | 104.3 ± 65.65 | <0.0001 | Yes |
| pNN20 | 42.61 ± 22.02 | 31.39 ± 20.28 | <0.0001 | Yes |
| NN50 | 32.12 ± 31.33 | 30.05 ± 29.21 | 0.1573 | No |
| pNN50 | 10.02 ± 9.808 | 9.069 ± 8.903 | 0.0279 | Yes |
| VLF power | 0.517 ± 0.374 | 0.453 ± 0.399 | <0.0001 | Yes |
| LF power | 0.298 ± 0.220 | 0.209 ± 0.190 | <0.0001 | Yes |
| HF power | 0.256 ± 0.204 | 0.214 ± 0.190 | <0.0001 | Yes |
| Total power | 1.145 ± 0.770 | 1.053 ± 0.894 | 0.0005 | Yes |
| LF/HF ratio | 1.647 ± 1.202 | 1.190 ± 0.871 | <0.0001 | Yes |
| Respiratory rate power | 7.958 ± 6.532 | 6.060 ± 5.620 | <0.0001 | Yes |