Table 2. Comparison of predictive performance in development and validation cohort.

Models	C-index (95% CI)	AUC (95% CI)
Development cohort
Nomogram 1	0.96 (0.94–0.98)	0.89 (0.85–0.94)
Nomogram 2	0.99 (0.98–1.00)	0.85 (0.77–0.92)
Validation cohort
Nomogram 1	0.86 (0.78–0.94)	0.85 (0.77–0.91)
Nomogram 2	0.89 (0.80–0.97)	0.76 (0.33–0.79)

CI, confidence interval; AUC, area under curve.