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

Published in final edited form as: J Arthroplasty. 2018 Dec 22;34(4):619–625.e1. doi: 10.1016/j.arth.2018.12.019

TABLE 1.

Baseline characteristics of study cohort. (IQR=interquartile range)

Variable	Illinois	Missouri
Total admissions	236,333	138,544
Total knee arthroplasty: number (% of state total)	154,474 (65.4%)	96,028 (69.3%)
Total hip arthroplasty	81,859	42,516
Female Admissions: number (% of state total)	143,009 (60.5)	83,023 (59.9)
Median Area Deprivation Index (IQR)	68.8 (22.8)	87.3 (19.0)
Median number of orthopedic surgeons in each county (IQR)	90 (489)	49 (148)
Number of admissions by year:
2011	35,547	20,321
2012	36,036	21,221
2013	37,485	22,597
2014	39,849	23,950
2015	41,889	23,962
2016	45,527	26,493