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Statistically significant (p < 0.05) Spearman’s correlations between maternal RMSSD and amplitude of 0.5 Hz peak, maternal and fetal RMSSDs in the study population.
| Pairs of parameters (X versus Y) | Group I | Group II | Group III |
|---|---|---|---|
| Amplitude of the RSA-associated peak (0.5 Hz) versus the maternal RMSSD | R = 0.64 | R = 0.36 | R = 0.20 |
| Maternal RMSSD versus fetal RMSSD | R = 0.51 | R = 0.32 | R = 0.18 |
