Fig. 4

Calibration plots of the nomogram for 2-year OS prediction of the training set (a), internal validation set (b) and external validation set (c), and for 2-year ASS prediction of the training set (d), internal validation set (e) and external validation set (f). X-axis represents the nomogram-predicted probability of survival; Y-axis represents the actual OS probability. A perfectly accurate nomogram prediction model would result in a plot in which 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 interval. OS overall survival, ASS advanced schistosomiasis-specific survival