Fig. 3

Calibration plots of the nomogram for survival prediction in the study cohort. X-axis represents the nomogram-predicted probability of survival; Y-axis represents the actual OS probability estimated using the Kaplan–Meier method. A perfectly accurate nomogram prediction model would result in a plot that the observed and predicted probabilities for given groups fall along the 45-degree line. Dots with bars represent nomogram-predicted probabilities along with 95% confidence intervals. These calibration curves showed good agreement between prediction and observation in the probabilities of 1-, 2-, and 3-year OS