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Comparison of Incidence by Average Volume per Year
| Variable | Volume per Year ≥ 4 (n = 9) |
Volume per Year < 4 (n = 98) |
p Value |
|---|---|---|---|
| Total volume, n | 540 | 529 | |
| Total 30-day mortality, n | 7 | 8 | 0.80 |
| Total morbidity, n | 93 | 141 | |
| Total composite end point, n | 94 | 145 | |
| Composite end point incidence, % | 17.4 | 27.4 | <0.001 |
