Table 2 Demographics, socioeconomic measures, and comorbidity of patients who underwent THR and TKR in physician owned and non physician owned specialty hospitals

Characteristic

MD Owned n = 1,814

Non MD Owned n = 8,664

P-value

MD Owned n = 4,770

Non MD Owned n = 10,542

P-value

DEMOGRAPHICS

Age, mean (SD), (years)

75.1 (6.4)

75.4 (6.3)

.02

75.0 (6.2)

75.3 (6.2)

< .001

Sex, women, %

1,137 (62.7)

5,367 (62.0)

.36

3,113 (65.3)

6,736 (63.9)

.10

Race

   Non-Hispanic white, %

1,694 (93.4)

8,233 (95.1)

.005

4,270 (89.5)

9,621 (91.3)

.001

   Black, %

46 (2.5)

276 (3.1)

.145

89 (1.8)

668 (6.3)

< .001

   Hispanic, %

36 (2.0)

23 (0.3)

< .001

268 (5.6)

59 (0.5)

< .001

   Asian, %

*

20 (0.2)

.93

*

32 (0.3)

.13

Median per-capita income ($), (sd)

21,800 (10,480)

32,450 (19,500)

< .001

19,800 (9,000)

28,300 (16,600)

< .001

COMORBIDITY

Diabetes

   All, %

134 (7.3)

749 (8.7)

.08

517 (10.8)

1,276 (12.1)

.03

   With complications, %

*

35 (0.4)

.06

*

75 (0.7)

< .001

Congestive heart failure,%

*

276 (3.2)

< .001

34 (0.7)

340 (3.2)

< .001

Renal failure, %

0 (0.0)

26 (0.3)

.02

*

48 (0.4)

.001

Obesity, %

50 (2.8)

472 (5.5)

< .001

186 (3.9)

973 (9.2)

< .001

COPD, %

97 (5.3)

1,012 (11.7)

< .001

299 (6.3)

1,207 (11.5)

< .001

Previous Joint Replacement, %

210 (11.6)

1,839 (21.2)

< .001

211 (4.4)

809 (7.7)

< .001

Fracture, %

17 (0.9)

225 (2.6)

< .001

n/a

n/a

Admitted as transfer from another acute care hospital, %

*

45 (0.5)

.007

*

*

.71