Table 1.
The results of the Delta waves examination (waves from C3, C4 channels). The values are expressing the wave amplitude (in μV), with demonstration of main distribution parameters (including median and quartiles); p-values are referring to the results of the Wilcoxon test in a given set of records.
| Mode | Pre-COVID | Post-COVID | p | |
|---|---|---|---|---|
| C3, eyes open | mean ± SD | 15.06 ± 0.83 | 13.58 ± 3.52 | p = 0.073 |
| Median | 15.11 | 12.85 | ||
| Quartiles | 14.46–15.5 | 10.46–16.61 | ||
| C4, eyes open | mean ± SD | 15.49 ± 0.85 | 16.66 ± 3.84 | p = 0.24 |
| Median | 15.69 | 15.44 | ||
| Quartiles | 14.76–15.84 | 13.57–21.45 | ||
| C3, eyes closed | mean ± SD | 14.35 ± 0.56 | 14.38 ± 3 | p = 0.927 |
| Median | 14.39 | 14.26 | ||
| Quartiles | 14.05–14.65 | 11.89–17.36 | ||
| C4, eyes closed | mean ± SD | 14.94 ± 0.92 | 16.41 ± 3.21 | p = 0.067 |
| Median | 14.76 | 15.44 | ||
| Quartiles | 14.59–15.31 | 13.78–19.08 | ||
p-ilcoxon paired test.