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Table 1 Neonatal data for boys, girls, and combined in term and preterm pregnancies

From: Sex differences in fetal growth and immediate birth outcomes in a low-risk Caucasian population

  Total (N = 9413) Boys (N = 4900, 52.1%) Girls (N = 4513, 47.9%) p value*
GA at birth (wks, 0/7d), mean ± std 39wks2/7 ± 1wks5d 39wks2/7 ± 1wks5d 39wks3/7 ± 1wks5d 0.02
Birth weight (g), mean ± std 3392 ± 512 3450 ± 515 3329 ± 502 < 0.001
Length (cm), mean ± std 50.5 ± 2.4 50.9 ± 2.4 50.1 ± 2.4 < 0.001
HC (cm), mean ± std 34.6 ± 1.6 34.9 ± 1.6 34.3 ± 1.5 < 0.001
1-min AS ≤ 5 3.4% 3.8% 2.9% 0.01
5-min AS ≤ 7 2.8% 3.2% 2.3% 0.009
pH Umb Art, mean ± std 7.27 ± 0.07 7.269 ± 0.072 7.274 ± 0.075 < 0.001
pH < 7.10, mean ± std 1.9% (177), 7.04 ± 0.06 0.9% (82), 7.041 ± 0.059 1.0% (95), 7.042 ± 0.062 0.90
BE < − 10 mEq/L, mean ± std 1.4% (132), − 13.46 ± 4.01 0.8% (71), − 13.8 ± 4.2 0.6% (61), − 13.1 ± 3.7 0.30
  1. Neonatal demographic data available in 9413 (76%) of the selected cases “2002–2012.” *p value represents difference in boys vs girls
  2. GA gestational age, wks weeks, d days, g gram, cm centimeter, HC head circumference, AS Apgar scores, pH pondus hydrogenium, Umb Art umbilical artery, BE base excess, std standard deviation