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

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