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. Author manuscript; available in PMC: 2014 Mar 3.

Published in final edited form as: Am J Obstet Gynecol. 2013 Jul 17;209(3):254.e1–254.e5. doi: 10.1016/j.ajog.2013.06.019

Table 1. Maternal demographics^a.

Demographic	Singleton gestation^b (n = 100,513)	Twin gestation^b (n = 891)
Maternal age, y	27.2 ± 6.2	29.4 ± 6.5
Gestational age, wks	39.1 ± 1.5	36.5 ± 1.5
Body mass index, kg/m²	25.1 ± 6.0	26.0 ± 6.8
Race
White	51.6 (49,297)	57.1 (481)
African American	23.5 (22,456)	27.0 (227)
Hispanic	16.8 (16,045)	11.2 (94)
Asian/Pacific Islander	5.0 (4808)	2.1 (18)
Other	3.0 (2872)	2.6 (22)

^a

All P < .01;

^b

Data expressed as mean ± SD or % (n).