The accuracy of prehospital triage decisions in English trauma networks – a case-cohort study

Fuller, G.; Baird, J.; Keating, S.; Miller, J.; Pilbery, R.; Kean, N.; McKnee, K.; Turner, J.; Lecky, F.; Edwards, A.; Rosser, A.; Fothergill, R.; Black, S.; Bell, F.; Smyth, M.; Smith, JE.; Perkins, GD.; Herbert, E.; Walters, S.; Cooper, C.

doi:10.1186/s13049-024-01219-9

Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine

Table 3 Diagnostic accuracy metrics for ambulance service triage tools and prehospital provider triage decisions (conveyed to MTC with pre-alert) evaluated against the primary MATTS reference standard

From: The accuracy of prehospital triage decisions in English trauma networks – a case-cohort study

Tool number	Tool name	n	TP	FP	TN	FN	Sensitivity	Sens LCL	Sens UCL	Specificity	Spec LCL	Spec UCL	Positive LR	Positive LR LCL	Positive LR UCL	Negative LR	Negative LR LCL	Negative LR UCL
1	LAS Step 1	2,757	303	151	1,647	656	0.32	0.29	0.35	0.92	0.90	0.93	3.76	3.15	4.50	0.75	0.64	0.88
2	LAS Steps 1/2	2,757	540	266	1,532	419	0.56	0.53	0.59	0.85	0.84	0.87	3.81	3.36	4.31	0.51	0.45	0.59
3	LAS Steps 1/2/3	2,757	548	267	1,531	411	0.57	0.54	0.60	0.85	0.84	0.87	3.85	3.40	4.35	0.50	0.44	0.57
4	LAS Steps 1/2/3/4	2,757	836	1,272	526	123	0.87	0.85	0.89	0.29	0.27	0.31	1.23	1.19	1.28	0.44	0.37	0.52
5	SWAS	2,757	319	135	1,663	640	0.33	0.30	0.36	0.92	0.91	0.94	4.43	3.68	5.33	0.72	0.61	0.85
6	WMAS Step 1	2,757	333	164	1,634	626	0.35	0.32	0.38	0.91	0.90	0.92	3.81	3.21	4.51	0.72	0.62	0.84
7	WMAS Steps 1/2	2,757	443	224	1,574	516	0.46	0.43	0.49	0.88	0.86	0.89	3.71	3.22	4.27	0.61	0.54	0.70
8	WMAS Steps 1/2/3	2,757	509	261	1,537	450	0.53	0.50	0.56	0.85	0.84	0.87	3.66	3.22	4.15	0.55	0.48	0.63
9	WMAS Steps 1/2/3/4	2,757	827	1,295	503	132	0.86	0.84	0.88	0.28	0.26	0.30	1.20	1.15	1.24	0.49	0.42	0.58
10	YAS Step 1	2,757	308	168	1,630	651	0.32	0.29	0.35	0.91	0.89	0.92	3.44	2.90	4.08	0.75	0.64	0.87
11	YAS Steps 1/2	2,757	501	283	1,515	458	0.52	0.49	0.55	0.84	0.83	0.86	3.32	2.94	3.75	0.57	0.50	0.64
12	YAS Steps 1/2/3	2,757	510	284	1,514	449	0.53	0.50	0.56	0.84	0.83	0.86	3.37	2.98	3.80	0.56	0.49	0.63
13	YAS Steps 1/2/3/4	2,757	809	1,289	509	150	0.84	0.82	0.87	0.28	0.26	0.30	1.18	1.13	1.22	0.55	0.48	0.64
14	LAS triage decisions	622	118	50	399	55	0.68	0.61	0.75	0.89	0.86	0.92	6.13	4.63	8.11	0.36	0.25	0.50
15	SWAS triage decisions	687	66	9	422	190	0.26	0.20	0.31	0.98	0.97	0.99	12.35	6.26	24.35	0.76	0.40	1.45
16	WMAS triage decisions	801	154	11	471	165	0.48	0.43	0.54	0.98	0.96	0.99	21.15	11.67	38.36	0.53	0.29	0.96
17	YAS triage decisions	647	108	25	411	103	0.51	0.44	0.58	0.94	0.92	0.96	8.93	5.97	13.35	0.52	0.35	0.78
18	Overall triage decisions	2,757	446	95	1,703	513	0.47	0.43	0.50	0.95	0.94	0.96	8.80	7.16	10.83	0.56	0.46	0.69

TP True positive, FP False positive, TN True negative, FN False negative, LCL Lower confidence interval limit, UCL Upper confidence interval limit, LR Likelihood ratio

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