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Table 4 Birth/placental weight ratios, umbilical cord blood PO2 (mmHg), O2 saturation (%) and fractional O2 extraction values in low-risk patients

From: Fetal sex impacts birth to placental weight ratio and umbilical cord oxygen values with implications for regulatory mechanisms

 

Males N = 18,335

Females N = 18,263

Birth/placental weight

5.37 ± 0.84

5.28 ± 0.82***

Umbilical vein PO2

27.9 ± 6.1

28.3 ± 6.1***

Umbilical artery PO2

15.9 ± 5.2

15.7 ± 5.1***

Umbilical vein O2 saturation

62.4 ± 14.8

63.5 ± 14.5***

Umbilical artery O2 saturation

26.8 ± 12.9

26.2 ± 12.4***

Fractional O2 extraction

0.57 ± 0.17

0.58 ± 0.17***

  1. Data presented as means ± SD; ***p < 0.001 vs respective Male group unadjusted for any covariates. Low-risk = no smoking, hypertension, diabetes, small or large for gestational age, delivery < 37 weeks, or delivery by cesarean section