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Median number of surgical procedures performed by high- and low-volume surgeonsa.
| Type of surgery | Median surgical procedures | |
| High-volume surgeons | Low-volume surgeons | |
| Bariatric surgery | 16 | 3 |
| Lumbar spinal fusion | 40 | 6 |
| Total knee replacement | 13 | 3 |
a As determined by bills submitted to NHI carrier in database from January 1, 2010 to December 31, 2010.
