Table 2.

Performance of bleeding scores

	Overall	Discrimination C-statistic (95% CI)			Calibration
	Brier score	For early death (within 24 h)	For massive transfusion (3 RBC/1 h)	For massive transfusion (10 RBC/24 h)	Outcome observed % (95% CI)a	Outcome predicted % (95% CI)a	P value	Calibration intercept (95% CI)	Calibration slope (95% CI)
Prehospital
BATT score	0.036	0.86 (0.84–0.87)*	0.75 (0.73–0.78)*	0.87 (0.84–0.90)	4.0 (3.6–4.3)	2.1 (2.0–2.2)	< 0.001	0.008 (0.005–0.012)	1.48 (1.40–1.56)
Shock Index b	–	0.53 (0.50–0.56)	0.71 (0.68–0.73)	0.84 (0.80–0.88)	–	–		–	–
ABC score b,c	–	0.63 (0.60–0.65)	0.66 (0.64–0.69)	0.82 (0.77–0.86)	–	–		–	–
TASH scored	–		–	–	–	–		–	–
In-Hospital
BATT score	0.034	0.87 (0.86–0.88)*	0.77 (0.75–0.79)	0.89 (0.86–0.91)	4.0 (3.6–4.3)	2.7 (2.6–2.8)	< 0.001	0.005 (0.001–0.008)	1.31 (1.24–1.37)
Shock Index b	–	0.61 (0.58–0.64)	0.74 (0.72–0.77)	0.89 (0.86–0.92)	–	–		–	–
ABC score b	–	0.66 (0.63–0.68)	0.70 (0.67–0.72)	0.84 (0.80–0.87)	–	–		–	–
TASH score	0.060	0.74 (0.72–0.76)	0.80 (0.78–0.82)**	0.94 (0.92–0.95)*	4.0 (3.6–4.3)	6.1 (5.8–6.5)	< 0.001	0.011 (0.008 -0.015)	0.46 (0.44–0.48)

^*P < 0.001 (compare to the highest score below); **P < 0.01

^aBATT score predicted death from bleeding compared to early death within 24 h; TASH score predicted massive transfusion (≥ 10 RBC/24 h) compared to ≥ 3 RBC within the first hour

^bThe Brier score, calibration in the large, calibration intercept and calibration slope cannot be estimated as SI and ABC score does not estimate a probability of massive transfusion, early death, or death from bleeding

^cABC score was estimated without ultrasonography (FAST) as ultrasonography is not available in routine in the prehospital setting

^dTASH score in the prehospital setting is not feasible as biological assay and imaging are not available