Table 3.
Adjusted rate, absolute difference in rates, and adjusted odds ratios of operative mortality for very low volume hospitals compared to very high volume hospitals (CI: confidence interval).
| PROCEDURE | Time Period | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2000-2001 | 2002-2003 | 2004 - 2005 | 2006-2007 | 2008-2009 | ||||||
| Hospital Volume | ||||||||||
| Very Low | Very High | Very Low | Very High | Very Low | Very High | Very Low | Very High | Very Low | Very High | |
| Pancreatectomy | ||||||||||
| Mortality rate (%) | 14.11 | 3.17 | 13.65 | 4.05 | 11.76 | 3.70 | 11.05 | 4.13 | 11.13 | 4.22 |
| Absolute difference in rates (%) | 10.94 | 9.60 | 8.06 | 6.92 | 6.91 | |||||
| Adjusted Odds Ratio (95% CI) | 5.83 (3.64 -9.36) | 4.21 (2.60 - 6.82) | 3.87 (2.91 - 5.16) | 3.19 (2.16 - 4.72) | 3.08 (2.07 - 4.57) | |||||
| Colectomy | ||||||||||
| Mortality rate (%) | 9.22 | 8.68 | 9.73 | 8.84 | 9.75 | 8.44 | 9.97 | 8.28 | 10.29 | 8.92 |
| Absolute difference in rates (%) | 0.54 | 0.89 | 1.31 | 1.69 | 1.37 | |||||
| Adjusted Odds Ratio (95% CI) | 1.08 (1.01 - 1.15) | 1.13 (1.06 - 1.21) | 1.20 (1.12 - 1.29) | 1.27 (1.18 - 1.36) | 1.20 (1.13 - 1.28) | |||||
| Esophagectomy | ||||||||||
| Mortality rate (%) | 16.76 | 8.90 | 15.37 | 9.16 | 15.01 | 5.80 | 15.14 | 7.49 | 13.94 | 4.72 |
| Absolute difference in rates (%) | 7.86 | 6.21 | 9.21 | 7.65 | 9.22 | |||||
| Adjusted Odds Ratio (95% CI) | 2.25 (1.57 - 3.23) | 1.92 (1.36 - 2.70) | 3.18 (2.41 - 4.18) | 2.41 (1.66 - 3.52) | 3.68 (2.66 - 5.11) | |||||
| Coronary Artery Bypass Grafting | ||||||||||
| Mortality rate (%) | 4.88 | 4.13 | 4.87 | 4.12 | 4.78 | 3.87 | 4.65 | 3.52 | 3.95 | 2.83 |
| Absolute difference in rates (%) | 0.75 | 0.75 | 0.91 | 1.13 | 1.12 | |||||
| Adjusted Odds Ratio (95% CI) | 1.20 (1.08 - 1.34) | 1.21 (1.08 - 1.34) | 1.26 (1.12 - 1.42) | 1.36 (1.21 - 1.52) | 1.44 (1.28 - 1.61) | |||||
| Aortic Valve Replacement | ||||||||||
| Mortality rate (%) | 8.06 | 6.17 | 8.44 | 6.25 | 8.49 | 5.69 | 7.98 | 5.01 | 7.64 | 4.50 |
| Absolute difference in rates (%) | 1.89 | 2.19 | 2.80 | 2.97 | 3.14 | |||||
| Adjusted Odds Ratio (95% CI) | 1.36 (1.16 - 1.59) | 1.41 (1.22 - 1.65) | 1.58 (1.34 - 1.86) | 1.68 (1.44 - 1.98) | 1.80 (1.56 - 2.08) | |||||
| Mitral Valve Replacement | ||||||||||
| Mortality rate (%) | 13.62 | 11.00 | 13.40 | 10.30 | 13.31 | 9.86 | 13.51 | 8.80 | 11.30 | 7.20 |
| Absolute difference in rates (%) | 2.62 | 3.10 | 3.45 | 4.71 | 4.10 | |||||
| Adjusted Odds Ratio (95% CI) | 1.30 (1.08 - 1.56) | 1.38 (1.13 - 1.68) | 1.44 (1.18 - 1.77) | 1.67 (1.32 - 2.10) | 1.69 (1.36 - 2.09) | |||||
| Abdominal Aortic Aneurysm Repair | ||||||||||
| Mortality rate (%) | 6.60 | 5.00 | 5.56 | 3.73 | 4.25 | 3.43 | 4.06 | 2.88 | 3.85 | 2.74 |
| Absolute difference in rates (%) | 1.60 | 1.83 | 0.82 | 1.18 | 1.11 | |||||
| Adjusted Odds Ratio (95% CI) | 1.39 (1.19 - 1.62) | 1.59 (1.35 - 1.88) | 1.28 (1.07 - 1.52) | 1.48 (1.21 - 1.81) | 1.48 (1.27 - 1.72) | |||||
| Carotid Endarterectomy | ||||||||||
| Mortality rate (%) | 1.26 | 0.96 | 1.43 | 1.11 | 1.35 | 0.99 | 1.29 | 1.11 | 1.12 | 0.88 |
| Absolute difference in rates (%) | 0.30 | 0.32 | 0.36 | 0.18 | 0.24 | |||||
| Adjusted Odds Ratio (95% CI) | 1.32 (1.12 - 1.56) | 1.31 (1.11 - 1.52) | 1.38 (1.14 - 1.69) | 1.17 (.965 - 1.43) | 1.28 (1.08 - 1.53) | |||||