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Fetal autonomic brain age score [Skewness, gMSE3, pNN5] for quiet sleep segments ○ and [AMP, Skewness, gMSE3, pNN5, lnVLF/LF] for active sleep segments Δ vs. chronological age (in WGA), mean ± standard deviation, notice that 21–24 WGA and 37–40 WGA, respectively, are merged due to the small number of samples.
