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| Hospital | Complexity | Total | p value | |
|---|---|---|---|---|
| No | Yes (%) | |||
| Group A | 2,354 | 3,126 (57.0) | 5,480 | <0.01 |
| Group B | 877 | 242 (21.6) | 1,119 | |
| Total | 3,231 | 3,368 (51.0) | 6,599 | |
Group A = hospitals in which more than 100 procedures were performed; Group B = hospitals in which less than 100 procedures were performed.
