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Table 2 Neonatal data for boys, girls, and combined in preterm (< 37 weeks) pregnancies

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

  Total (N = 576) Boys (N = 317, 55.0%) Girls (N = 259, 45.0%) p value*
GA at birth (wks, 0/7d), mean ± std 34wks6/7 ± 2wks2/7 35wks0/7 ± 2wks1/7 34wks5/7 ± 2wks3/7 0.19
Birth weight (g), mean ± std 2481 ± 637 2553 ± 604 2392 ± 665 0.003
Length (cm), mean ± std 46.3 ± 4.2 46.8 ± 4.1 45.7 ± 4.3 0.005
HC (cm), mean ± std 32.5 ± 2.5 32.8 ± 2.4 32.2 ± 2.6 0.006
1-min AS ≤ 5 8.1% 8.6% 7.4% 0.62
5-min AS ≤ 7 7.9% 8.9% 6.7% 0.32
pH Umb Art, mean ± std 7.29 ± 0.07 7.285 ± 0.070 7.289 ± 0.076 0.50
  1. Neonatal demographic data available in 576 preterm 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, std standard deviation