Table 4.
Heart rate variability univariate analysis
| Heart rate variability feature | MCS (mean ± SD) | UWS (mean ± SD) | Mann–Whitney U test p value uncorrected for multiple comparisons |
Rank sum | z Value |
|---|---|---|---|---|---|
| Mean interbeat intervals (ms) | 892 ± 194 | 817 ± 134 | 0.3661 | 629 | 0.9037 |
| SD of interbeat intervals (ms) | 47 ± 24 | 34 ± 23 | 0.1525 | 643 | 1.4309 |
| Root mean square of successive differences (ms) | 37 ± 29 | 19 ± 13 | 0.0768 | 652 | 1.7698 |
| Very low-frequency power (ms2) | 1.64 ± 4.04 107 | 3.83 ± 4.88 107 | 0.4743 | 585 | −0.7155 |
| Low-frequency power (ms2) | 468 ± 571 | 207 ± 276 | 0.1752 | 641 | 1.3556 |
| High-frequency power (ms2) | 637 ± 840 | 180 ± 189 | 0.1320 | 645 | 1.5062 |
| Low-/high frequency ratio | 1.68 ± 2.09 | 1.54 ± 2.11 | 0.8213 | 611 | 0.2259 |