Calibration plot of the prognostic model in the training and test cohorts. (A) Calibration plot of the prognostic model for the training cohort. (B) Calibration plot of the prognostic model system for the test cohort. The x-axis plots the predicted 30-day mortality of ICH in adult patients with ITP; the y-axis plots the observed 30-day mortality in our study. A 45° diagonal line represents the ideal calibration plot.