Table 3.

Unadjusted mortality rates for grouped continuous variables in the derivation dataset

Variable	Range	Deaths/Patients	Mortality (%)
Age	0–4	6/157	3.8
	5–14	12/378	3.2
	15–24	63/1126	5.6
	25–34	50/1139	4.4
	35–44	43/825	5.2
	45–54	45/587	7.7
	55–64	43/464	9.3
	65–74	55/285	19.3
	75–84	69/293	23.5
	85+	38/109	34.9
ISS	0–8	7/1762	0.4
	9–15	17/1365	1.2
	16–24	48/1002	4.8
	25–34	168/781	21.5
	35–49	98/291	33.7
	50–75	86/162	53.1
NISS	0–8	6/1659	0.4
	9–15	13/961	1.4
	16–24	18/906	2.0
	25–34	63/970	6.5
	35–49	77/393	19.6
	50–75	247/474	52.1
T-RTS	0–3	66/71	93.0
	4–6	54/92	58.7
	7	35/74	47.3
	8	74/184	40.2
	9	43/199	21.6
	10	43/370	11.6
	11	42/492	8.5
	12	67/3881	1.7

Data from 5363 patients, forming the derivation dataset. Mortality increased with increasing age, ISS and NISS and decreased with T-RTS.

ISS, Injury Severity Score; NISS, New Injury Severity Score; T-RTS, Triage Revised Trauma Score.