Table 1a.

Summary of other key categorical variables and PHCCT attendance (yes/no)

Variable	Category	PHCCT		Non-PHCCT
		N	%	N	%
Gender	Male	565	72.8	7641	56.6
	Female	211	27.2	5863	43.4
Patient taken to prospective Major Trauma Centre (MTC)	Yes	595	76.7	4421	32.7
	No	181	23.3	9083	67.3
Mode of transport to hospital	Land ambulance	569	73.3	13 288	98.4
	Air ambulance	207	26.7	216	1.6
Severe head injury	Yes	194	25.0	2354	17.4
	No	582	75.0	11 150	82.6
Prehospital intubation	Yes	212	27.3	109	0.8
	No	564	72.7	13 395	99.2
Major trauma (Injury Severity Score: ISS >15)	Yes	444	57.2	2632	19.5
	No	332	42.8	10 872	80.5
Scottish Index of Multiple Deprivation (SIMD) Quintile	1 (most deprived)	164	21.1	3644	27.0
	2	128	16.5	2729	20.2
	3	143	18.4	2153	15.9
	4	115	14.8	1903	14.1
	5 (least deprived)	102	13.1	1615	12.0
	Unknown	124	16.0	1460	10.8

PHCCT, prehospital critical care team.