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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Am J Obstet Gynecol. 2011 Jun 29;205(4):372.e1–372.e6. doi: 10.1016/j.ajog.2011.06.087

Table 1.

Participant characteristics

All women n=559

Maternal age (yrs) 32.0 ± 5.4

Race/Ethnicity
 White 338 (60.5)
 Asian/Pacific Islander 77 (13.8)
 Black 74 (13.2)
 Hispanic 53 (9.5)
 Other or >1 race/ethnicity 17 (3.0)

Gestational age at enrollment (wks) 39.4 ± 1.25

Method of delivery
 Vaginal 407 (72.8)
 Cesarean 152 (27.2)

Number of gestations
 Singleton 555 (99.3)
 Multiple 4 (0.7)

Data are presented as mean ±standard deviation or n (%)