Predicted versus observed mortality in the entire cohort based on original GAP index
| Year | Patients (N) | Predicted mortality* (%) | Observed mortality† (%) | Ratio‡ |
| Stage I§ | ||||
| 1 | 96 | 5.6 | 1.9 | 0.34 |
| 2 | 68 | 10.9 | 5.6 | 0.51 |
| 3 | 50 | 16.3 | 12.0 | 0.74 |
| Stage II§ | ||||
| 1 | 207 | 16.2 | 12.8 | 0.79 |
| 2 | 131 | 29.9 | 25.9 | 0.87 |
| 3 | 85 | 42.1 | 37.5 | 0.89 |
| Stage III§ | ||||
| 1 | 94 | 39.2 | 30.7 | 0.78 |
| 2 | 55 | 62.1 | 45.7 | 0.74 |
| 3 | 30 | 76.8 | 60.6 | 0.79 |
*Based on reported values by Ley et al.5
†Based on Kaplan-Meier estimates of mortality in our cohort.
‡Ratio of observed to predicted mortality.
§Stages as defined by Ley et al.5
GAP, gender-age-physiology.