Fig. 3

The calibration plot of the models for predicting massive hemorrhage in trauma. a: model 1 (P = 0.405); b: model 2 (P = 0.243). Calibration focuses on the accuracy of the absolute risk prediction of the model, that is, the consistency between the probability of massive hemorrhage in trauma predicted by the model and that actually observed. The y-axis represents the actual rate of massive hemorrhage. The x-axis represents the predicted probability of massive hemorrhage. For a well-calibrated model, the scatter points should be arranged along a 45-degree diagonal line. P > 0.05 means no significant difference, and the calibration of the model is good