TABLE 2.

Risks of MDI Scores Associated With Pregnancy Characteristics and Exposures During Pregnancy

Pregnancy Characteristics		<55	55–69	≥70	Row N
Smoking prepregnancy	Yes	14	12	75	212
	No	11	11	79	685
Smoking during pregnancy	Yes	12	15	73	117
	No	11	10	79	781
Passive smoking	Yes	14	9	77	212
	No	11	11	78	683
Years since last pregnancy	<1	8	15	77	107
	1–2	14	15	71	144
	2+	15	12	73	267
Conception assistance	Yes	6	8	87	197
	No	13	12	75	698
No. of prenatal visits	10+	9	14	77	619
	< 10	12	10	78	273
Vaginal bleeding	Yes	9	11	80	361
during 1st 12 wk	No	13	11	76	534
Vaginal bleeding	Yes	8	11	81	261
after 12 wk	No	13	11	77	634
Fever during pregnancy	Yes	9	12	79	58
	No	11	11	78	837
Vaginal/cervical infection	Yes	14	14	72	113
	No	11	10	79	782
Urinary tract infections	Yes	8	13	79	134
	No	12	10	75	761
Highest white blood cell counta	>20 K	9	4	88	187
	≤20 K	12	13	75	715
Any medication	Yes	12	11	78	786
	No	9	13	78	108
Aspirin	Yes	15	11	71	46
	No	11	11	78	846
Nonsteroidal anti-inflammatory drugs	Yes	9	12	79	57
	No	12	11	78	834
Acetaminophen	Yes	9	9	82	453
	No	14	12	74	438
Antibiotic	Yes	11	13	77	265
	No	12	10	78	627
Maximum no. of infants		103	99	719	921
Percent		11	11	78

These are row percents.

^aWithin the interval from before delivery to 48 h after delivery.