Table 4:

Unadjusted and adjusted models for the association between maternal race and ethnicity and maternal obstetric outcomes

Outcome		Unadjusted Odds Ratio (95% Confidence Interval)	Partially adjusted Odds ratio* (95% Confidence Interval)	Fully adjusted Odds Ratio† (95% Confidence Interval)
Maternal severe morbidity composite outcome a
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	2.85 (2.38, 3.42)	1.24 (0.96, 1.61)	1.26 (0.95, 1.67)
	Hispanic	1.06 (0.83, 1.34)	1.34 (0.99, 1.81)	1.29 (0.94, 1.77)
Blood transfusion ≥4 units b
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	2.54 (1.46, 4.39)	3.09 (1.76, 5.40)	2.83 (1.56, 5.14)
	Hispanic	1.95 (1.06, 3.57)	2.11 (1.13, 3.97)	1.97 (1.01, 3.83)
Unanticipated surgical intervention c
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	0.76 (0.46, 1.27)	0.82 (0.49, 1.39)	0.87 (0.51, 1.49)
	Hispanic	1.05 (0.65, 1.72)	1.05 (0.62, 1.78)	0.99 (0.57, 1.72)
Intubation > 12 hours
	Non-Hispanic White	Referent	N/A	N/A
	Non-Hispanic Black	1.51 (0.76, 2.99)	N/A	N/A
	Hispanic	0.91 (0.39, 2.12)	N/A	N/A
ICU admission d
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	7.33 (5.52, 9.73)	6.16 (4.59, 8.28)	6.55 (4.80, 8.93)
	Hispanic	1.08 (0.71, 1.65)	1.03 (0.66, 1.60)	1.01 (0.64, 1.59)
Failure of ≥ 1 organ system e
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	1.22 (0.94, 1.60)	1.06 (0.80, 1.40)	1.11 (0.82, 1.50)
	Hispanic	0.86 (0.63, 1.18)	0.97 (0.70, 1.36)	0.97 (0.68, 1.38)
Secondary outcomes Hysterectomy
	Non-Hispanic White	Referent	N/A	N/A
	Non-Hispanic Black	1.60 (0.52, 4.98)	N/A	N/A
	Hispanic	0.97 (0.24, 3.88)	N/A	N/A
Blood transfusion ≥3 unitsf
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	2.10 (1.33, 3.32)	2.30 (1.45, 3.66)	2.20 (1.34, 3.60)
	Hispanic	1.53 (0.92, 2.57)	1.87 (1.09, 3.21)	1.63 (0.92, 2.90)
Postpartum endometritisg
	Non-Hispanic White	Referent	Referent	Referent
	Non-Hispanic Black	3.37 (2.12, 5.35)	3.37 (2.10, 5.39)	3.42 (2.12, 5.51)
	Hispanic	3.88 (2.43, 6.17)	4.44 (2.77, 7.10)	4.26 (2.64, 6.89)

Partially adjusted model:

^aAdjusted for hospital, chronic hypertension, tobacco use, maternal BMI, and gestational age at delivery

^bAdjusted for maternal BMI and multiple gestation

^cAdjusted for multiple gestation

^dAdjusted for chronic hypertension, maternal age, and gestational age at delivery

^eAdjusted for tobacco use and gestational age at delivery

Fully adjusted model:

^aAdjusted for hospital, chronic hypertension, tobacco use, HDP severity, and gestational age at delivery

^bAdjusted for number of prenatal visits, HDP severity, and multiple gestation

^cAdjusted for multiple gestation

^dAdjusted for chronic hypertension, HDP severity, maternal age, and gestational age at delivery

^eAdjusted for tobacco use, HDP severity, and gestational age at delivery

^fAdjusted for number of prenatal visits, tobacco use, and HDP severity

^gAdjusted for parity and HDP severity

ICU=intensive care unit, HDP=hypertensive disorders of pregnancy