Table 5.
Relative Differences to Length of Stay
| Patient Factors | |||||
|---|---|---|---|---|---|
| Total Knee Arthroplasty | Total Hip Arthroplasty | ||||
| Gender | MALE | 1.000 | -- | 1.000 | -- |
| FEMALE | 1.020 | p = 0.000 | 1.026 | p = 0.000 | |
| Age | 18-59 | 1.000 | -- | 1.000 | -- |
| 60-68 | 1.020 | p = 0.000 | 1.011 | p = 0.036 | |
| 68-75 | 1.014 | p = 0.048 | 1.006 | p = 0.560 | |
| 75+ | 1.053 | p = 0.000 | 1.084 | p = 0.000 | |
| Race | WHITE | 1.000 | -- | 1.000 | -- |
| BLACK | 1.035 | p = 0.000 | 1.056 | p = 0.000 | |
| OTHER* | 1.011 | p = 0.117 | 0.988 | p = 0.250 | |
| MISSING | 1.005 | p = 0.628 | 0.999 | p = 0.897 | |
| Charlson score |
0 | 1.000 | -- | 1.000 | -- |
| 1 | 1.045 | p = 0.000 | 1.056 | p = 0.000 | |
| 2+ | 1.124 | p = 0.000 | 1.174 | p = 0.000 | |
| Income | $1-24,999K | 1.011 | p = 0.322 | 1.038 | p = 0.008 |
| $25,000-34,999 | 1.012 | p = 0.012 | 0.992 | p = 0.288 | |
| $35,000-44,999 | 1.010 | p = 0.013 | 1.003 | p = 0.629 | |
| $45,000+ | 1.000 | -- | 1.000 | -- | |
| Insurance | PRIVATE | 1.000 | -- | 1.000 | -- |
| MEDICARE | 1.031 | p = 0.000 | 1.027 | p = 0.006 | |
| MEDICAID | 1.088 | p = 0.000 | 1.103 | p = 0.000 | |
| DUAL ENROLL | 1.025 | p = 0.049 | 1.078 | p = 0.000 | |
| OTHER | 1.039 | p = 0.000 | 1.061 | p = 0.000 | |
| Provider Factors | |||||
|---|---|---|---|---|---|
| Hospital Region |
NORTHEAST | 1.000 | -- | 1.00 | -- |
| MIDWEST | 0.986 | p = 0.539 | 0.964 | p = 0.122 | |
| SOUTH | 1.092 | p = 0.003 | 1.077 | p = 0.013 | |
| WEST | 1.037 | p = 0.309 | 0.999 | p = 0.978 | |
| Setting | URBAN | 1.000 | -- | 1.000 | -- |
| RURAL | 1.021 | p = 0.257 | 1.038 | p = 0.040 | |
| Teaching Status |
NON-TEACHING | 1.000 | -- | 1.000 | -- |
| TEACHING | 1.003 | p = 0.861 | 1.012 | p = 0.583 | |
| Bed Size | SMALL | 1.000 | -- | 1.000 | -- |
| MEDIUM | 1.004 | p = 0.856 | 1.007 | p = 0.733 | |
| LARGE | 1.007 | p = 0.700 | 1.013 | p = 0.517 | |
| Surgeon Volume (Cases/year) |
TKA: 1-17; THA: 1-10 | 1.108 | p = 0.000 | 1.188 | p = 0.000 |
| TKA: 18-35; THA: 11-21 | 1.052 | p = 0.007 | 1.073 | p = 0.005 | |
| TKA: 36-66; THA: 22-52 | 0.977 | p = 0.250 | 1.052 | p = 0.038 | |
| TKA: ≥ 67; THA: ≥53 | 1.000 | -- | 1.000 | -- | |
| MISSING | 1.040 | 0.446 | 1.090 | p = 0.019 | |
| Hospital Volume (Cases/year) |
TKA: 1-100; THA: 1-64 | 1.113 | p = 0.000 | 1.146 | p = 0.001 |
| TKA: 101-197; THA: 65-123 | 0.999 | p = 0.982 | 1.055 | p = 0.152 | |
| TKA: 198-293; THA: 124-224 | 1.031 | p = 0.288 | 1.030 | p = 0.368 | |
| TKA: ≥ 294; THA: ≥ 225 | 1.000 | -- | 1.000 | -- | |
| Hospital Ownership |
NON-PROFIT | 1.000 | -- | 1.000 | -- |
| PUBLIC | 1.023 | p = 0.422 | 1.025 | p = 0.390 | |
| FOR-PROFIT | 1.002 | p = 0.923 | 1.033 | p = 0.187 | |
| PRIVATE (NOT SPECIFIED) | 0.961 | p = 0.052 | 0.963 | p = 0.047 | |
Other race includes: Hispanic, Native American, Asian or Pacific Islander, or Other