Table 1.

Comprehensive list of demographic data collected from the NIS database of patients undergoing TKA and rTKA from 2006 to the third quarter of 2015

	TKA (n = 5,901,057)	rTKA (n = 465,968)
Age of Patient (Years)
Mean (Standard Error)	66.30 (0.04)	66.56 (0.06)
Biological Sex of Patient
Male	2,197,685 (37.24%)	207,630 (44.56%)
Female	3,703,371 (62.76%)	258,338 (55.44%)
Expected Primary Payor
Medicare	3,265,481 (55.34%)	279,009 (59.88%)
Private	2,226,286 (37.73%)	140,970 (30.25%)
Self-Pay	26,031 (0.44%)	2,474 (0.53%)
No Charge	4,680 (0.08%)	357 (0.08%)
Other Insurance	203,329 (3.45%)	25,254 (5.42%)
Race of Patient
Non-Hispanic White	4,204,427 (71.25%)	330,671 (70.96%)
Non-Hispanic Black	378,244 (6.41%)	38,451 (8.25%)
Hispanic	274,034 (4.64%)	19,462 (4.18%)
Calendar Year of Discharge
2006	477,858 (8.10%)	39,303 (8.44%)
2007	529,082 (8.97%)	42,324 (9.08%)
2008	586,937 (9.95%)	47,870 (10.27%)
2009	592,657 (10.07%)	45,358 (9.73%)
2010	627,691 (10.64%)	49,894 (10.71%)
2011	613,742 (10.40%)	52,149 (11.19%)
2012	627,534 (10.63%)	50,235 (10.78%)
2013	659,295 (11.17%)	50,315 (10.80%)
2014	677,656 (11.48%)	50,620 (10.86%)
2015	508,604 (8.62%)	37,900 (8.13%)
Bedsize of Hospital
Small	1,168,666 (19.80%)	81,509 (17.49%)
Medium	1,561,211 (26.46%)	119,456 (25.64%)
Large	3,150,403 (53.39%)	262,634 (56.36%)
Unknown	20,777 (0.35%)	2,369 (0.51%)
Location/Teaching Status of Hospital
Rural	695,816 (11.79%)	42,418 (9.10%)
Urban Nonteaching	2,577,382 (43.68%)	183,223 (39.32%)
Urban Teaching	2,607,082 (44.18%)	237,958 (51.07%)
Unknown	20,777 (0.35%)	2,369 (0.51%)
Region of Hospital
Northeast	988,218 (16.75%)	80,848 (17.35%)
Midwest	1,617,066 (27.40%)	117,620 (25.24%)
South	2,156,781 (36.55%)	177,236 (38.04%)
West	1,138,992 (19.30%)	90,263 (19.37%)
Elective Admission
Non-Elective	n/a	80,947 (17.37%)
Elective	n/a	383,949 (82.40%)
Unknown	n/a	1,072 (0.23%)