Table 3. C-indexes for the nomogram to predict overall survival and cancer-specific survival.

Group	OS		CSS
	C-index	95% CI	C-index	95% CI
Training cohort	0.794	0.789 to 0.799	0.760	0.753 to 0.767
Validation cohort	0.787	0.779 to 0.795	0.769	0.758 to 0.780

Abbreviations: OS, overall survival; CSS, cancer-specific survival; C-index, index of concordance; CI, confidence interval.