Table 2 Univariate and rad score-based analyses of overall survival in the training and test sets
Feature | Training set | Test set | |||
|---|---|---|---|---|---|
C-index | p value (log-rank test) | C-index (95%CI) | p value (log-rank test) | ||
kVCT-based radiomics | Rad score | 0.558 | < 0.01 | 0.685 (0.679–0.691) | < 0.01 |
MVCT-based radiomics | Rad score | 0.562 | < 0.01 | 0.667 (0.661–0.673) | < 0.01 |
Clinical factor | Age | 0.573 | < 0.01 | 0.583 (0.579–0.588) | 0.94 |
Stage | 0.576 | 0.70 | 0.538 (0.535–0.541) | 0.40 | |
Treatment method | 0.600 | 0.32 | 0.622 (0.617–0.627) | 0.08 | |
Histology | 0.588 | 0.20 | 0.576 (0.572–0.581) | 0.20 | |
Brinkman index | 0.504 | 0.08 | 0.571 (0.566–0.576) | 0.18 | |
Tumor volume | 0.551 | < 0.01 | 0.621 (0.615–0.627) | < 0.01 | |