. Author manuscript; available in PMC: 2020 Aug 1.

Published in final edited form as: Am J Obstet Gynecol. 2019 Apr 6;221(2):136.e1–136.e9. doi: 10.1016/j.ajog.2019.04.005

Table 1:

Patient characteristics (n = 12,761)

Characteristic	n	%
Age
≤49	2404	19%
50–59	4788	37%
60–69	3697	29%
≥70	1872	15%

Charlson comorbidity index
0	11010	86%
1	1425	11%
≥2	326	3%

Year of diagnosis
2006 – 2008	3041	24%
2009 – 2011	5263	41%
2012 – 2015	4457	35%

Insurance plan
HMO (Health Maintenance Organization)	1447	11%
PPO (Preferred Provider Organization)	7469	59%
Other	3845	30%

Region of care
Northeast	2595	20%
North Central	3353	27%
South	4367	34%
West	2303	18%
Unknown	148	1%