Table 3.

C-index of the five models.

Models	Training cohort (N = 230)	Validation cohort (N = 97)
Clinical data	0.563 (95% CI: 0.493–0.634)	0.456 (95% CI: 0.443–0.470)
Overall stage	0.641 (95% CI: 0.604–0.679)	0.689 (95% CI: 0.677–0.701)
Radiomics	0.749 (95% CI: 0.713–0.783)	0.836 (95% CI: 0.823–0.849)
Radiomics + overall stage	0.766 (95% CI: 0.729–0.804)	0.839 (95% CI: 0.827–0.853)
Radiomics + overall stage + EBV DNA	0.805 (95% CI: 0.768–0.841)	0.874 (95% CI: 0.861–0.887)