Table 3A. Perinatal outcomes for multiple vs. singleton gestation.

	Multiple Gestation	Single Gestation	Relative Risk (95% CI)*	P-Value
Total Infants, N	1,268	68,988
Birth Outcome, N (%)				<.0001
Stillbirth	99 (7.8)	2,008 (2.9)	3.2 (2.4, 4.2)
Born alive, died Before perinatal visit	160 (12.6)	1,338 (1.9)	7.7 (6.2, 9.6)
Alive at perinatal visit	1,009 (79.6)	65,640 (95.1)	1.00
Gestational age†, N
Mean ± SD	35.8 ± 5.2	38.7 ± 4.4		<.0001

^*Adjusted for site

^†determined by last menstrual period or best obstetric estimate if LMP unknown(8)