A population-based study of race-specific risk for placental abruption

Table 4 Relative contribution of placental abruption to preterm birth in Black compared to White women (stratified analysis)

Birth Outcome		Black	White	P*
	n (%)	n (%)	n (%)
Abruption and Term Births (≥ 35)†	3,310	605	2,705	< 0.001
Number of Term Births	635,772	99,213	536,559
Frequency of Abruption	(0.52)	(0.61)	(0.50)
Abruption and Late PTB (32–34)†	725	161	564	< 0.001
Number of Late PTB	16,292	5,128	11,164
Frequency of Abruption	(4.45)	(3.14)	(5.05)
Abruption and Very PTB (28–31)†	550	168	382	0.015
Number of Very PTB	6,869	2,483	4,386
Frequency of Abruption	(8.01)	(6.77)	(8.71)
Abruption and Extreme PTB (20–27)†	466	170	296	0.029
Number of Extreme PTB	3,929	1,658	2,271
Frequency of Abruption	(11.86)	(10.25)	(13.03)

* The p value for chi-square test.
† Binary variable restricted to subpopulations of term births, late PTB, very PTB, and extreme PTB, OR was calculated using binary logistic regression.

ISSN: 1471-2393