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

Table 5 Number of deaths due to bleeding avoided and number needed to treat with pre-hospital treatment within 3 h of injury according to BATT score threshold as treatment criteria

BATT Score Threshold for TXA treatment	Total patients included in TARN N (%)	Number of patients considered for treatment^a N (%)	Number of deaths avoided by BATT score threshold	Standardized number of deaths avoided per 10,000	Number needed to treat^b	Additional NNT^c for change of one point of BATT score
≥ 14	586 (< 1)	534 (< 1)	37	4.7	14	–
≥ 13	737 (< 1)	671 (< 1)	42	5.3	16	27
≥ 12	960 (1)	883 (1)	47	5.9	19	42
≥ 11	1266 (1)	1150 (1)	53	6.7	22	45
≥ 10	1727 (2)	1557 (2)	59	7.4	27	23
≥ 9	2533 (2)	2272 (2)	68	8.6	34	79
≥ 8	3859 (4)	3420 (3)	80	10.1	43	128
≥ 7	6879 (7)	5898 (6)	97	12.2	61	146
≥ 6	10,071 (10)	8584 (8)	109	13.7	78	224
≥ 5	16,032 (15)	13,335 (13)	124	15.6	108	317
≥ 4	22,946 (22)	18,769 (18)	136	17.1	138	452
≥ 3	33,483 (32)	27,062 (26)	152	19.1	179	518
≥ 2	80,071 (76)	61,598 (59)	210	26.4	293	595
≥ 1	89,948 (86)	68,452 (65)	216	27.2	316	1142
≥ 0	104,862 (100)	79,430 (76)	224	28.2	354	1372

TXA Tranexamic acid, NNT Number needed to treat
^aNumber of trauma patients within 3 h of injury and the arrival of the first ambulance. Proportions are based on all patients included in the TARN registry with ISS ≥ 9
^bStandardized number of deaths avoided per 10,000 trauma patients within 3 h included in the TARN registry with an ISS ≥9
^cAdditional trauma patients needed to treat for each death avoided compared to the BATT score threshold above

ISSN: 1757-7241