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

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%)