Table 1 Patient and provider characteristics of patients treated with TKA, in the in- vs. outpatient setting, before and after matching

N

9,365

39,337

9,060

9,060

Age: mean (SD)

67.2 (8.7)

66.9 (9.4)

67.4 (8.4)

67.5 (8.6)

Age Category

 18 to 34

2 (0.0%)

46 (0.1%)

0

0

 35 to 44

75 (0.8%)

383 (1.0%)

43 (0.5%)

43 (0.5%)

 45 to 54

656 (7.0%)

3,487 (8.9%)

592 (6.5%)

592 (6.5%)

 55 to 64

2,445 (26.1%)

11,227 (28.5%)

2,369 (26.1%)

2,369 (26.1%)

 65 to 74

4,346 (46.4%)

15,654 (39.8%)

4,264 (47.1%)

4,264 (47.1%)

 75 and Older

1,841 (19.7%)

8,540 (21.7%)

1,792 (19.8%)

1,792 (19.8%)

Sex: Male (vs Female)

3,787 (40.4%)

15,383 (39.1%)

3,648 (40.3%)

3,648 (40.3%)

Race Category

 Asian

82 (0.9%)

382 (1.0%)

82 (0.9%)

85 (0.9%)

 Black

718 (7.7%)

3,195 (8.1%)

694 (7.7%)

651 (7.2%)

 Other

546 (5.8%)

2,738 (7.0%)

525 (5.8%)

602 (6.6%)

 Unknown

143 (1.5%)

354 (0.9%)

135 (1.5%)

72 (0.8%)

 White

7,876 (84.1%)

32,668 (83.0%)

7,624 (84.2%)

7,650 (84.4%)

Payor

 Commercial

2,622 (28.0%)

12,763 (32.4%)

2,547 (28.1%)

2,436 (26.9%)

 Medicaid

296 (3.2%)

1,307 (3.3%)

230 (2.5%)

236 (2.6%)

 Medicare

6,146 (65.6%)

23,707 (60.3%)

6,043 (66.7%)

6,041 (66.7%)

 Other

301 (3.2%)

1,560 (4.0%)

240 (2.6%)

347 (3.8%)

Urban Hospital (vs Rural)

7,870 (84.0%)

34,588 (87.9%)

7,700 (85.0%)

7,657 (84.5%)

Hospital Size

 000 to 099

1,449 (15.5%)

4,113 (10.5%)

1,367 (15.1%)

1,367 (15.1%)

 100 to 199

1,997 (21.3%)

6,919 (17.6%)

1,912 (21.1%)

1,912 (21.1%)

 200 to 299

1,987 (21.2%)

9,304 (23.7%)

1,957 (21.6%)

1,957 (21.6%)

 300 to 399

1,896 (20.2%)

8,082 (20.5%)

1,865 (20.6%)

1,865 (20.6%)

 400 to 499

1,310 (14.0%)

4,480 (11.4%)

1,245 (13.7%)

1,245 (13.7%)

 500 or larger

726 (7.8%)

6,439 (16.4%)

714 (7.9%)

714 (7.9%)