Table 2.
Concordance indices and 3-year AUCs of different models in the training, internal test, prospective test, and external test cohorts
| Training cohort |
Validation cohort |
Prospective test cohort |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C-index (95% CI) | P | 3-year AUC (95% CI) | p | C-index (95% CI) | p | 3-year AUC (95% CI) | p | C-index (95% CI) | p | 3-year AUC (95% CI) | p | |
| Sommat’s model | 0.514 (0.490–0.537) | <0.001 | 0.535 (0.496–0.574) | <0.001 | 0.538 (0.461–0.615) | <0.001 | 0.556 (0.435–0.677) | <0.001 | 0.536 (0.510–0.562) | <0.001 | 0.583 (0.540–0.626) | <0.001 |
| Zhou’s model | 0.549 (0.518–0.581) | <0.001 | 0.560 (0.513–0.607) | <0.001 | 0.571 (0.491–0.652) | <0.001 | 0.591 (0.457–0.725) | 0.001 | 0.629 (0.589–0.669) | <0.001 | 0.675 (0.609–0.741) | 0.002 |
| Radiomics risk model | 0.681 (0.653–0.710) | RE | 0.723 (0.681–0.765) | RE | 0.704 (0.632–0.777) | RE | 0.777 (0.663–0.892) | RE | 0.725 (0.687–0.762) | RE | 0.763 (0.699–0.827) | RE |
Abbreviation: AUC, area under the curve; C-indices, concordance index; CI, confidence interval; RE, reference.