Table 3.
Role of Hospital Volume in Explaining Declining Mortality among Medicare Patients Who Underwent High-Risk Procedures from 1999 through 2000 and from 2007 through 2008.
| Procedure | Proportion of the Difference in Mortality Explained by Increased Hospital Volume | ||
|---|---|---|---|
| More Patients Nationwide (“Volume Creep”) | Redistribution of Patients to Higher-Volume Hospitals (Market Concentration) | Overall Effect | |
| percent | |||
| Esophagectomy | 0 | 32 | 32 |
|
| |||
| Pancreatectomy | 18 | 49 | 67 |
|
| |||
| Lung resection | 16 | 0 | 16 |
|
| |||
| Cystectomy | 17 | 20 | 37 |
|
| |||
| AAA repair | 7 | 4 | 11 |
|
| |||
| CABG | 0 | 0 | 0 |
|
| |||
| Carotid endarterectomy | 0 | 0 | 0 |
|
| |||
| Aortic-valve replacement | 6 | 3 | 9 |
*
AAA denotes abdominal aortic aneurysm, and CABG coronary-artery bypass grafting.