Table 4

Mixed-effect logistic regression analysis for mortality among total geriatric patients

		All patients		ISS <16		ISS ≥16
		OR	95% CI	OR	95% CI	OR	95% CI
Age		1.05	1.048 to 1.057	1.06	1.056 to 1.07	1.052	1.048 to 1.057
Gender
	Female	–	–	–	–	–	–
	Male	1.48	1.39 to 1.57	1.97	1.70 to 2.78	1.278	1.192 to 1.373
Mechanism of injury
	Penetrating	–	–	–	–	–	–
	Blunt	1.42	1.10 to 1.83	2.01	1.28 to 3.16	0.93	0.68 to 1.28
ISS		1.06	1.057 to 1.064	1.05	1.03 to 1.08	1.049	1.045 to 1.052
GCS		0.74	0.73 to 0.741	0.46	0.43 to 0.50	0.41	0.399 to 0.421
SBP		0.997	0.996 to 0.998	0.989	0.987 to 0.991	0.998	0 .997 to 0.999
RR		1.023	1.019 to 1.028	1.034	1.025 to 1.043	1.015	1.011 to 1.020
Transportation
	Ambulance	–	–	–	–	–	–
	Ambulance with doctor	0.77	0.66 to 0.89	1.09	0.68 to 1.74	0.77	0.66 to 0.90
	Helicopter	0.76	0.68 to 0.84	0.75	0.53 to 1.06	0.76	0.69 to 0.85
Whole-body CT		0.96	0.90 to 1.03	1.1	0.90 to 1.35	0.93	0 .86 to 1.01
Year
	2008	1.53	1.32 to 1.88	1.10	0.76 to 1.61	1.65	1.39 to 1.95
	2009	1.50	1.30 to 1.73	1.35	0.98 to 1.86	1.52	1.29 to 1.78
	2010	1.27	1.11 to 1.46	1.12	0.83 to 1.52	1.30	1.12 to 1.51
	2011	1.11	0.98 to 1.27	0.81	0.59 to 1.11	1.18	1.03 to 1.36
	2012	1.17	1.04 to 1.32	0.91	0.69 to 1.19	1.23	1.08 to 1.40
	2013	–	–	–	–	–	–
	2014	0.91	0.81 to 1.02	0.93	0.73 to 1.20	0.89	0.77 to 1.02
	2015	0.89	0.80 to 0.999	0.76	0.66 to 1.09	0.90	0.79 to 1.02
	2016	0.79	0.69 to 0.91	0.76	0.56 to 1.04	0.79	0.68 to 0.91
	2017	0.88	0.76 to 1.01	0.98	0.74 to 1.30	0.84	0.72 to 0.99

GCS, Glasgow Coma Scale; ISS, Injury Severity Score; RR, respiratory rate; SBP, systolic blood pressure.