Table 3.
Observed versus expected rates using P-POSSUM mortality score.
| Mortality risk % | Number of Patients | Observed number of deaths | Expected Number of deaths | O:E |
|---|---|---|---|---|
| ≤10 | 118 | 8 | 6 | 1.33 |
| >10 to ≤20 | 15 | 3 | 2 | 1.50 |
| >20 to ≤ 30 | 7 | 3 | 2 | 1.50 |
| >30 to ≤40 | 11 | 3 | 4 | 0.75 |
| >40 to ≤ 50 | 11 | 5 | 5 | 1.00 |
| >50 to ≤60 | 5 | 3 | 3 | 1.00 |
| >60 to ≤70 | 7 | 5 | 5 | 1.00 |
| >70 to ≤80 | 4 | 2 | 3 | 0.67 |
| >80 to ≤90 | 2 | 2 | 2 | 1.00 |
| >90 to ≤100 | 1 | 1 | 1 | 1.00 |
| Total | 181 | 35 | 33 | 1.06 |
An O/E ratio of 1.00 indicates outcomes as expected and less than 1.00 indicates outcomes better than expected and >1.00 outcomes worse than expected.