Fig. 4
Calibration plot for validation cohort (n = 112) and Harrell’s C-index value for the nomogram predicting survival. The calibration curves for the nomogram are shown and depict the predicted and actual 3-, 6- and 12-months OS rates. Actual survival rates with 95% CIs were calculated by Kaplan–Meier analysis. Calibration estimates how close the risk estimated by the nomogram is to the observed risk and is depicted by a calibration plot. The nomogram makes an optimistic prediction for the training cohort (the solid line is below the gray line). CI, confidence interval; OS, overall survival.
