Table 2.
Hosmer-Lemeshow goodness of fit test for P-POSSUM for 30-day mortality
| Deciles of risk (%) | Number of patients | Number of observed deaths | Number of expected deaths | Mean risk of predicted mortality | O:E (95% CI) | X 2HL statistic |
|---|---|---|---|---|---|---|
| 0-10 | 2150 | 38 | 52.42 | 0.02 | 0.73 (0.69-0.76) | 4.06 |
| 10-20 | 203 | 19 | 28.64 | 0.14 | 0.66 (0.61-0.72) | 3.78 |
| 20-30 | 73 | 7 | 18.27 | 0.25 | 0.38 (0.32-0.45) | 9.27 |
| 30-40 | 46 | 6 | 16.05 | 0.35 | 0.37 (0.30-0.45) | 9.67 |
| 40-50 | 29 | 6 | 13.14 | 0.45 | 0.46 (0.38-0.54) | 7.10 |
| 50-60 | 17 | 3 | 9.36 | 0.55 | 0.32 (0.23-0.42) | 9.63 |
| 60-70 | 18 | 5 | 11.45 | 0.64 | 0.43 (0.35-0.53) | 10.01 |
| 70-80 | 10 | 2 | 7.62 | 0.76 | 0.26 (0.17-0.37) | 17.48 |
| 80-90 | 3 | 1 | 2.53 | 0.84 | 0.40 (0.23-0.59) | 6.05 |
| 90-100 | 3 | 1 | 2.87 | 0.96 | 0.40 (0.23-0.59) | 29.62 |
| 0-100 | 2552 | 88 | 162.35 | 0.06 | 0.54 (0.47-0.62) | 106.67 |
X2HL statistic =106.67; df =8; p <0.0001.