. Author manuscript; available in PMC: 2022 Sep 1.

Published in final edited form as: Am J Obstet Gynecol MFM. 2021 May 13;3(5):100395. doi: 10.1016/j.ajogmf.2021.100395

TABLE 1.

Baseline characteristics of women with and without anemia

Maternal characteristics	No anemia (n=156,349)	Anemia (n=10,217)	P value
Maternal age (y) (n=166,467)	27.7±6.2^a	26.2±6.2^a	<.001^a
Prepregnancy BMI (kg/m²) (n=121,460)	25.4±6.2^a	25.9±6.5^a	<.001^a
Nulliparity (n=166,566)	63,082 (40.4)^a	3957 (38.7)^a	.001^a
Race and ethnicity (n=166,565)			<.001^a
White	71,231 (45.6)^a	4724 (46.2)^a
Non-Hispanic Black	38,989 (24.9)^a	3444 (33.7)^a
Hispanic	30,441 (19.5)^a	1312 (12.8)^a
Other	15,687 (10.0)^a	737 (7.2)^a
Marital status (n=163,190)			<.001^a
Married	93,850 (61.2)^a	4673 (46.4)^a
Divorced	2379 (1.6)^a	240 (2.4)^a
Single	56,884 (37.2)^a	5164 (51.3)^a
Education status (n=68,716)			.001^a
More than HS diploma	32,493 (49.8)^a	1603 (46.6)^a
Less than HS diploma	12,781 (19.6)^a	722 (21.0)^a
HS diploma	20,000 (30.6)^a	1117 (32.5)^a
Insurance (n=143,834)			<.001^a
Private	78,732 (58.8)^a	4780 (48.1)^a
Public	53,182 (39.7)^a	4982 (50.2)^a
Self-pay	1992 (1.5)^a	166 (1.7)^a
History of cesarean delivery (n=154,917)	21,503 (14.5)^a	1706 (18.4)^a	<.001^a
Pregestational diabetes (n=166,565)	3927 (2.5)^a	152 (1.5)^a	<.001^a
Chronic hypertension (n=152,293)	4825 (3.4)	301 (3.1)	.173
Asthma (n=166,565)	9756 (6.2)^a	972 (9.5)^a	<.001^a
Gestational diabetes (n=148,848)	4728 (3.4)^a	302 (3.0)^a	.016^a
Tobacco use (n=166,566)	8906 (5.7)	552 (5.4)	.214
Alcohol use (n=166,566)	3244 (2.1)^a	343 (3.4)^a	<.001^a

Data are presented as number (percentage) or mean±standard deviation.

BMI, body mass index; HS, high school.

Denotes statistical significance.