TABLE 1.

A univariate analysis of the maternal and placental information in Groups A and B

	N	Group A	%	Group B	%	Odds ratio	95% CI		p Value
Maternal age ≥35 years	7,678	2,306/7,635	30.2	14/43	32.6	1.11	0.54	2.18	.74
Multipara	7,636	3,851/7,594	50.7	18/42	42.9	0.72	0.37	1.4	.35
Fertility treatment	7,450	807/7,407	10.9	3/43	7	0.61	0.12	1.93	.62
Alcohol	5,834	209/5,794	3.6	3/40	7.5	2.16	0.42	6.92	.17
Smoking	5,817	401/5,777	6.9	1/40	2.5	0.34	0.01	2.04	.52
GDM	7,647	555/7,604	7.3	0/43	0	0	0	1.14	.07
Hypertensive disorders of pregnancy	7,650	814/7,607	10.7	14/43	32.6	4.02	1.95	7.9	<.01
Placental weight <−1.28SD	5,715	853/5,679	15	17/36	47.2	5.06	2.45	10.3	<.01
Abnormal placental cord insertion	5,292	593/5,255	11.3	14/37	37.8	4.7	2.62	9.76	<.01

Abbreviations: CI, confidence interval; GDM, gestational diabetes mellitus.