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Table 3 Performance of the BATT score

From: Validation of the BATT score for prehospital risk stratification of traumatic haemorrhagic death: usefulness for tranexamic acid treatment criteria

  BATT score 95% CI
Overall performance
 Brier score 0.0107  
 Scaled Brier score (%) 6  
Discrimination
 C-statistic 0.90 0.89–0.91
Mean predicted death due to bleeding (%)
 If patient died from bleeding 6.5  
 If patient did not die from bleeding 1.1 1.1–1.1
 Discrimination slope (%) 5.4 0.053–0.056
Calibration
 Observed deaths due to bleeding (%) 1.16 1.1–1.2
 Predicted deaths due to bleeding (%) 1.15 1.1–1.2
 Calibration-in-the-large (%) 0.01 0.00–0.01
 Ratio Predicted/Observed 0.99 0.94–1.05
 Calibration Intercept 0.00032  
 Calibration slope 1.09 1.07–1.11