Tertile 1, N (%)	Tertile 3, N (%)	P-Value
Deliveries	165276 (100)	87712 (100)
Death1	<10 (<0.01)	12 (0.01)	0.03
Transfers	345 (0.21)	457 (0.52)	<0.001
Hysterectomy	222 (0.13)	158 (0.18)	0.005
Ventilation	118 (0.07)	147 (0.17)	<0.001
Renal Failure	103 (0.06)	141 (0.16)	<0.001
Cardiac Arrest1	<10 (<0.01)	<10 (<0.01)	1
Heart Failure Procedure	333 (0.2)	452 (0.52)	<0.001
Shock	72 (0.04)	73 (0.08)	<0.001
Sepsis	47 (0.03)	43 (0.05)	0.009
Coagulation	461 (0.28)	450 (0.51)	<0.001
Amniotic Embolism1	<10 (0.01)	<10 (<0.01)	0.07
Thrombotic Embolism	26 (0.02)	59 (0.07)	<0.001
Puerperal CVD	54 (0.03)	70 (0.08)	<0.001
Anesthesia Complications	35 (0.02)	37 (0.04)	0.003
Pulmonary Edema	43 (0.03)	43 (0.05)	0.003
Respiratory Distress	85 (0.05)	101 (0.12)	<0.001
AMI1	<10 (<0.01)	<10 (<0.01)	0.42
Eclampsia	40 (0.02)	71 (0.08)	<0.001
Blood Transfusion	1686 (1.02)	3201 (3.65)	<0.001
Sickle Cell Anemia	23 (0.01)	31 (0.04)	<0.001
Intracranial Injury1	<10 (<0.01)	<10 (<0.01)	0.35
Injury Thorax/Abdomen/Pelvis1	<10 (<0.01)	<10 (<0.01)	0.12
Aneurysm1	<10 (<0.01)	<10 (<0.01)	1
Heart Surgery	86 (0.05)	95 (0.11)	<0.001
Cardio monitoring1	<10 (<0.01)	<10 (<0.01)	1
Tracheostomy1	<10 (<0.01)	<10 (<0.01))	1
Conversion cardiac rhythm	12 (0.01)	12 (0.01)	0.13
Severe Maternal Morbidity	2253 (1.4)	3862 (4.4)	<0.001
Race/Ethnicity2
Asian	38640 (23.4)	8175 (9.3)	<0.001
Black	16936 (10.3)	27164 (31.0)
Hispanic	35004 (21.2)	30883 (35.2)	<0.001
White	71993 (43.6)	19776 (22.6)
Other race	2703 (1.6)	1714 (1.9)

¹Number of events masked in the compliance with SPARCS regulations

²NOTE: differs from percentage given in the manuscript, which measures the percent of black and white women that deliver in each tertile.