Table 8.
Observed and predicted mortality according to the POSSUM and p-POSSUM surgical scoring systems
| Mortality rate* | Patients, no. | POSSUM†, no. | p-POSSUM†, no. | Observed, no. |
|---|---|---|---|---|
| 0–10 | 25 | 3 | 1 | 1 |
| 11–20 | 12 | 3 | 2 | 0 |
| 21–30 | 10 | 4 | 4 | 1 |
| 31–40 | 15 | 7 | 5 | 0 |
| 41–50 | 14 | 8 | 6 | 2 |
| 51–60 | 12 | 8 | 7 | 1 |
| 61–70 | 9 | 6 | 6 | 2 |
| 71–80 | 15 | 12 | 11 | 7 |
| 81–90 | 15 | 13 | 13 | 4 |
| 91–100 | 18 | 17 | 17 | 4 |
| Total, no. (%) | 145 | 81 (56) | 72 (50) | 22 (15) |
POSSUM = Physiological and Operative Severity Score for the enumeration of Mortality and morbidity; p-POSSUM = Portsmouth-POSSUM.
*
Based on p-POSSUM predicted mortality.
†
Both POSSUM and p-POSSUM significantly overpredicted death (p < 0.001) when analyzed using the Hosmer–Lemeshow goodness of fit test.