Table 1. Baseline Characteristics of Patients At Time of First Pregnancy, Stratified by the Occurrence of Aortic Complications During Pregnancy.

Characteristic*	Aortic Complication (N = 36)	No Aortic Complication (N = 4,933,661)	P Value
Age, mean (SD), y	29.2 (7.0)	27.3 (6.8)	0.11
Age <35 years	27 (75.0)	4,027,057 (81.6)	0.31
White race†	11 (30.6)	2,121,171 (43.0)	0.13
Private insurance	15 (41.7)	2,732,249 (55.4)	0.10
Vascular risk factors
Absence of pre-existing hypertension	31 (86.1)	4,895,363 (99.2)	<0.001
Absence of pre-eclampsia	21 (58.3)	4,505,942 (91.3)	<0.001
Absence of eclampsia	36 (100.0)	4,929,694 (99.9)	0.87
Absence of connective tissue disorder§	32 (88.9)	4,933,033 (99.9)	<0.001

Abbreviations: SD, standard deviation.

^*Data are presented as number (%) of participants unless otherwise specified. Comparisons were made using the chi-square test or t-test.

^†Self-reported by patients or their surrogates.

^§Marfan, Turner, or Ehler-Danlos Syndromes.