Table 2

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

THR
 TKR
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

* numbers of patients in these cells were small (< = 12). These numbers were suppressed to protect the confidentiality of patient information in accordance with Medicare policies.

Cram et al. BMC Health Services Research 2007 7:155   doi:10.1186/1472-6963-7-155