. 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 4.

Association of maternal anemia with maternal outcomes

Maternal outcome	Unadjusted OR	95% CI	Adjusted OR^a	95% CI
SMM composite outcome^b	1.93^c	1.78–2.08^c	2.04^c	1.86–2.23^c
Maternal death	7.71^c	2.26–26.35^c	18.10^c	2.48–131.61^c
Eclampsia	2.05^c	1.27–3.31^c	1.74	0.89–3.40
Antepartum thrombosis	2.30^c	1.74–3.04^c	2.95^c	2.09–4.16^c
Postpartum thrombosis	3.30^c	1.96–5.55^c	2.59^c	1.26–5.33^c
Transfusion in labor	3.10^c	2.69–3.57^c	3.16^c	2.61–3.83^c
Transfusion postpartum	1.85^c	1.69–2.02^c	1.84^c	1.66–2.05^c
Hysterectomy	5.83^c	3.82–8.87^c	7.66^c	4.57–12.85^c
Maternal ICU admission	1.13	0.88–1.46	4.07^c	2.87–5.75^c
SMM composite without transfusion	2.73^c	2.29–3.25^c	3.40^c	2.73–4.22^c
Postpartum hemorrhage	2.15^c	2.03–2.28^c	2.08^c	1.94–2.24^c
Preeclampsia or eclampsia or HELLP	1.50^c	1.38–1.64^c	1.33^c	1.18–1.50^c
Cesarean delivery	1.49^c	1.40–1.53^c	1.47^c	1.37–1.57^c
Composite infectious morbidity^d	1.16^c	1.04–1.29^c	1.42^c	1.24–1.61^c
Wound infection	1.94^c	1.55–2.42^c	2.17^c	1.71–2.76^c
Intrapartum chorioamnionitis	0.96	0.84–1.09	1.18^c	1.01–1.38^c
Antepartum chorioamnionitis	1.88^c	1.57–2.24^c	1.68^c	1.26–2.23^c
Endometritis	0.96	0.72–1.29	1.10	0.74–1.65
Preterm delivery	1.09^c	1.03–1.16^c	1.05	0.97–1.14

CI, confidence interval; HELLP, hemolysis, elevated liver enzymes, and low platelet counts; ICU, intensive care unit; OR, odds ratio; SMM, severe maternal morbidity.

Confounders controlled for were maternal age, body mass index, nulliparity, maternal race, marital status, insurance, diabetes, asthma, history of cesarean delivery, and alcohol use;

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

Denotes statistical significance;

Composite includes wound infection, chorioamnionitis, endometritits.