. 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 2.

Maternal outcomes

Outcome	No anemia (n=156,349)	Anemia (n=10,217)	P value
SMM composite outcome^a (n=166,566)	6269 (4.0)^b	761 (7.5)^b	<.001^b
Maternal death (n=134,620)	7 (0.01)^b	4 (0.04)^b	<.001^b
Eclampsia (n=166,566)	142 (0.1)^b	19 (0.2)^b	.003^b
Postpartum thrombosis (n=110,635)	66 (0.1)^b	18 (0.2)^b	<.001^b
Antepartum thrombosis (n=134,576)	329 (0.3)^b	58 (0.6)^b	<.001^b
Transfusion during labor (n=110,635)	977 (1.0)^b	246 (2.9)^b	<.001^b
Transfusion postpartum (n=130,427)	4557 (3.7)^b	563 (6.7)^b	<.001^b
Hysterectomy (n=166,566)	79 (0.1)^b	30 (0.3)^b	<.001^b
Maternal ICU admission (n=166,565)	868 (0.6)	64 (0.6)	.350
SMM composite without transfusion (n=110,635)	697 (0.7)^b	156 (1.8)^b	<.001^b
Blood loss (mL) (n=118,081)	451.1±257.0^b	617.0±10,531.0^b	<.001^b
Postpartum hemorrhage (n=166,566)	10,785 (6.9)^b	1405 (13.8)^b	<.001^b
Preeclampsia or eclampsia or HELLP (n=166,566)	5856 (3.8)^b	565 (5.5)^b	<.001^b
Cesarean delivery (n=166,566)	44,416 (28.4)^b	3754 (36.7)^b	<.001^b
Composite infectious morbidity^c (n=166,566)	5027 (3.2)^b	378 (3.7)^b	.007^b
Wound infection (n=110,635)	564 (0.6)^b	90 (1.1)^b	<.001^b
Antepartum chorioamnionitis (n=93,431)	1052 (1.2)^b	144 (2.3)^b	<.001^b
Intrapartum chorioamnionitis (n=166,565)	4169 (2.7)	261 (2.6)	.496
Endometritis (n=67,754)	498 (0.8)	49 (0.8)	.801
GA at delivery (n=166,566)	38.5±2.3	38.5±2.4	.358
Preterm delivery (n=166,566)	18,716 (12.0)^b	1318 (12.9)^b	.005^b

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

GA, gestational age; HELLP, hemolysis, elevated liver enzymes, low platelet count; ICU, intensive care unit; SMM, severe maternal morbidity.

Composite includes maternal death, eclampsia, thrombosis, transfusion, hysterectomy, and ICU admission;

Denotes statistical significance;

Composite includes wound infection, chorioamnionitis, and endometritits.