Adjusted Comparison of Length of Stay and Hospital Charges by Provider Group
| Variable* | Length of hospital stay,† d |
|---|---|
| Surgeon volume | |
| < 9 v. > 27 | 2.4 (1.3, 3.4) |
| 9–27 v. > 27 | 1.2 (0.7, 1.7) |
| Hospital volume | |
| < 42 v. > 107 | 0.0 (−0.9, 0.7) |
| 42–107 v. > 107 | −0.5 (−1.0, −0.0) |
| Patient age, /10 yr | 0.9 (0.9, 1.0) |
| Patient comorbidity, 1 v. 0 | 1.3 (0.6, 2.0) |
| Patient diagnosis, OA v. non-OA | −1.7 (−2.6, −0.8) |
| Patient sex, F v. M | 0.6 (0.2, 1.0) |
| Discharge disposition, home v. transfer‡ | 0.7 (0.1, 1.3) |
↵* Generalized estimating equation regression techniques were used. Each variable in the table is adjusted for all others.
↵† Values are beta coefficients (with 95% confidence intervals). These coefficients may be interpreted as “days” for length of stay. Screened values are those found to be significant at p < 0.05.
↵‡ Home = the patient was discharged home with or without home care. Transfer = the patient was discharged to a rehabilitation facility or other institution following hip replacement.
OA = osteoarthritis