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| Observed and expected deaths | Overall | CABG | AVR | CABG + AVR | MVr | CABG + MVr | MVR | CABG + MVR |
|---|---|---|---|---|---|---|---|---|
| STS PROM (%) | 11 | 10.3 | 8.9 | 9.2 | 3.4 | 15.6 | 23.3 | 16.1 |
| Actual death (%) | 2.4 | 2.1 | 1.2 | 4.2 | 1.6 | 6.5 | 4.2 | 13.0 |
| O/E | 4.6 | 4.9 | 7.4 | 2.2 | 2.1 | 2.4 | 5.6 | 1.2 |
