Table 4. C-statistic value for the prediction of reaching median survival.
| Model | C-statistic | ΔC (P-value) | CI 95% low | CI 95% high |
|---|---|---|---|---|
| CHOP top quintile |
0.649 |
|
0.555 |
0.743 |
| Histology (all types) | 0.706 | 0.606 | 0.801 | |
| Histology (all types)+CHOP top quintile |
0.750 |
0.050 (ns) |
0.653 |
0.859 |
| ECOG PS | 0.826 | 0.712 | 0.941 | |
| ECOG+CHOP top quintile |
0.895 |
0.069 (ns) |
0.805 |
0.985 |
| EORTC score <1.27 | 0.667 | 0.567 | 0.767 | |
| EORTC score <1.27+CHOP top quintile |
0.718 |
0.052 (ns) |
0.613 |
0.825 |
| CT stage (all) | 0.748 | 0.581 | 0.915 | |
| CT stage (all)+CHOP | 0.855 | 0.107 (ns) | 0.725 | 0.985 |
| CT stage (I–III vs IV) | 0.608 | 0.483 | 0.797 | |
| CT stage (I–III vs IV)+CHOP | 0.797 | 0.188 (0.011) | 0.657 | 0.936 |
Abbreviations: CHOP=C/EBP homologous protein; CI=confidence interval; CT=computed tomography; EORTC, European Organisation for Research and Treatment of Cancer; ns=not statistically significant.
ΔC indicates difference in C-statistic from reference value due to addition of CHOP score to the model.