TABLE 1.
Characteristics of Patients Receiving Primary Total Knee Arthroplasty in Top-Ranked Hospitals, Non–Top-Ranked Hospitals, and Hospitals Ineligible for the U.S. News & World Report Rankings
| Top-ranked hospitals (n=10,477) | Non–top-ranked hospitals (n=28,938) | Ineligible hospitals (n=25,297) | P valuea | |
|---|---|---|---|---|
| Age, mean (SD), y | 74.4 (6.1) | 74.5 (6.1) | 74.2 (6.1) | <.001 |
| Female, No. (%) | 6775 (64.7) | 19,295 (66.7) | 16,640 (65.8) | <.001 |
| Race, No. (%) | ||||
| White | 9394 (89.7) | 25,592 (88.4) | 22,968 (90.8) | <.001 |
| Black | 776 (7.4) | 2290 (7.9) | 1453 (5.7) | |
| Other | 307 (2.9) | 1056 (3.7) | 876 (3.5) | |
| No. of medical comorbidities, mean (SD) | 2.0 (1.3) | 1.9 (1.2) | 1.9 (1.3) | <.001 |
| Comorbidity, No. (%) | ||||
| Diabetes (complicated) | 194 (1.9) | 364 (1.3) | 358 (1.4) | <.001 |
| Congestive heart failure | 481 (4.6) | 1241 (4.3) | 1175 (4.6) | .11 |
| Obesity | 1095 (10.5) | 3058 (10.6) | 2542 (10.1) | .13 |
| Renal failure | 387 (3.7) | 959 (3.3) | 772 (3.1) | .007 |
| Arthritis | 398 (3.8) | 945 (3.3) | 718 (2.8) | <.001 |
| Zip code–level median household income, mean (SD) | $53,517 ($21,002) | $50,103 ($18,521) | $45,023 ($16,008) | <.001 |
| Zip code–level high school graduation, mean (SD), % | 85.0 (10.0) | 83.0 (11.0) | 81.0 (10.0) | <.001 |
a
P values were obtained from analysis of variance test for continuous variables and χ2 test for categorical variables.