Table 1.

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

	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

Neonatal demographic data available in 9413 (76%) of the selected cases “2002–2012.” *p value represents difference in boys vs girls

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