Fig. 3

Calibration curves of the nomogram for predicting the risk of ICU admission in training (a) and validation cohort (b). Data on predicted and actual disease severity were plotted on the x- and y-axis, respectively. The diagonal dotted line indicates the ideal nomogram, in which actual and predicted probabilities are identical. The solid line indicates the actual nomogram, and a better fit to the dotted line indicates a better calibration