Table 1.

Maternal and Pregnancy characteristics of female and male fetuses

Characteristic	Female (28,954)	Male (28,216)
Age (y)*	31 (26, 35)	31 (26, 35)
AMA (%)	8,466 (29.2)	8,408 (29.8)
Nulliparous (%)	11,267 (38.9)	10,796 (38.3)
Race
African American (%)	6,567 (22.7)	6,426 (22.8)
White (%)	17,833 (61.6)	17,471 (62.0)
Other (%)	4,554 (15.7)	4,319 (15.3)
BMI (kg/m2)*	24.8 (21.7, 29.7)	24.7 (21.7, 29.5)
Smoking (%)	3,139 (10.9)	3,099 (11.0)
Chronic hypertension (%)	695 (2.4)	729 (2.6)
Preeclampsia (%)	2,313 (8.1)	2,269 (8.1)
Pre-gestational diabetes (%)	582 (2.0)	525 (1.9)
Gestational Diabetes (%)	1,555 (5.4)	1,463 (5.2)
SGA non-sex specific (%)†	1,683 (5.8)	2,526 (9.0)
SGA sex specific (%)†	1,465 (5.6)	3,307 (11.7)
Stillbirth (%)	177 (0.6)	142 (0.5)

^*Median (interquartile range)

^†p<0.05