Table 4.
The association between RMSSD and fetal breathing activity, study overview and results.
| Study | Analyses | RMSSD | |||
|---|---|---|---|---|---|
| References | Gestational age (weeks) | Specifications; unit | Breathing | Non-breathing | p-value |
| Gustafson et al. (2011) | 36–38 | RMSSD; ms2; median | 8.2 | 5.6 | 0.006 |
| Gustafson et al. (2012)α | >36 | RMSSD; ms2; mean | 6.36 (± 1.34) | 4.85 (± 1.45) | <0.001 |
| Ortiz et al. (2013) | 34 (±3.7) | RMSSD; ms2; meanβ | 7.0 | 3.96 | <0.05 |
| Arias-Ortega et al. (2016) | 34.2 (±2.6) | RMSSD; ms2; mean | 8.2 (± 2.09) | 4.8 (± 1.31) | <0.05 |
α
From Table 1 in Gustafson et al. (Gustafson et al., 2012), calculated by e(logRMSSD).
β
They write “conventional statistics of HRV: RMSSD”, but the unit is given as ms, but it must be ms2.