Table 2.
Results of multivariable generalized linear model of hospital arthroplasty costs
| Variable | Exp(B) (95% CI) | p value |
| Hospital volume | ||
| ≤ 10 | 1.32 (1.30 to 1.34) | < 0.001 |
| 11 to 100 | 1.17 (1.17 to 1.17) | < 0.001 |
| 101 to 200 | 1.10 (1.10 to 1.10) | < 0.001 |
| 200 + | Reference | |
| Gender | ||
| Men | Reference | |
| Women | 0.99 (0.99 to 0.99) | < 0.001 |
| Age in years | ||
| < 65 | Reference | |
| 65 to 74 | 0.92 (0.91 to 0.92) | < 0.001 |
| 78 to 84 | 0.91 (0.91 to 0.92) | < 0.001 |
| 85 and older | 0.94 (0.93 to 0.95) | < 0.001 |
| Race or ethnicity | ||
| White | Reference | |
| Black | 1.02 (1.02 to 1.03) | < 0.001 |
| Hispanic | 0.99 (0.98 to 1.00) | 0.10 |
| Other | 0.98 (0.98 to 0.99) | < 0.001 |
| Arthroplasty type | ||
| THA | Reference | |
| TKA | 1.02 (1.02 to 1.02) | < 0.001 |
| Hospital setting | ||
| Rural | Reference | |
| Urban | 0.90 (0.89 to 0.90) | < 0.001 |
| Large urban | 0.87 (0.86 to 0.87) | < 0.001 |
| Geographic location | ||
| Northeast | Reference | |
| South | 1.23 (1.23 to 1.24) | < 0.001 |
| Midwest | 1.13 (1.12 to 1.13) | < 0.001 |
| West | 1.17 (1.17 to 1.17) | < 0.001 |
| Puerto Rico | 0.59 (0.57 to 0.62) | < 0.001 |
| van Walraven index | 1.01 (1.01 to 1.01) | < 0.001 |
| Wage index | 2.13 (2.11 to 2.15) | < 0.001 |
| Resident-to-bed ratio | 1.30 (1.29 to 1.31) | < 0.001 |