Table 3.

Associations between traumatic brain injury mortality and the socio-demographic variables, estimated with the multivariate negative binomial regression model (Guangdong, 2014–2018)

Socio-demographic variable	TBI mortality by external cause of injury												Total TBI mortality
	Motor vehicle crashes			Falls			Struck by/against			All others
	MRR	95%CI		MRR	95%CI		MRR	95%CI		MRR	95%CI		MRR	95%CI
		Lower	Upper		Lower	Upper		Lower	Upper		Lower	Upper		Lower	Upper
Sex (reference = female)
Male	2.5*	2.1	3.0	2.1*	1.8	2.5	2.2*	1.2	3.9	2.1*	1.3	3.3	2.3*	2.0	2.6
Age (reference = 25 ~ 44 years)
0 ~ 4	0.5*	0.4	0.7	1.0*	0.8	1.4	0.6*	0.2	1.6	0.4*	0.2	1.1	0.6*	0.5	0.8
5 ~ 14	0.3*	0.2	0.3	0.3*	0.2	0.4	0.3*	0.1	1.0	0.2*	0.1	0.5	0.3*	0.2	0.3
15 ~ 24	0.9*	0.7	1.3	0.8*	0.6	1.1	0.7*	0.2	1.9	0.7*	0.1	1.5	0.9*	0.7	1.1
45 ~ 64	1.8*	1.3	2.4	2.8*	2.1	3.7	1.6*	0.6	4.5	1.7*	0.7	3.9	1.9*	1.6	2.4
65 ~ 74	3.0*	2.2	4.0	6.9*	5.2	9.1	1.6*	0.6	4.5	3.7*	1.6	8.6	3.8*	3.0	4.8
≥ 75	3.6*	2.7	4.9	31.0*	23.3	41.2	3.7*	1.3	10.5	8.8*	3.8	20.8	10.4*	8.3	13.0
Location (reference = urban)
Rural	2.5*	2.1	2.9	1.3*	1.1	1.5	2.9*	1.6	5.0	2.6*	1.6	4.3	2.0*	1.8	2.3
Year (reference = 2014)
2015	1.3*	1.0	1.6	1.2*	1.0	1.6	0.6*	0.3	1.5	0.8*	0.4	1.6	1.2*	1.0	1.4
2016	1.1*	0.8	1.4	1.0*	0.8	1.2	0.5*	0.2	1.1	0.6*	0.3	1.3	1.0*	0.8	1.2
2017	1.1*	0.9	1.5	1.2*	1.0	1.6	0.6*	0.2	1.4	0.6*	0.3	1.3	1.1*	0.9	1.3
2018	0.9*	0.7	1.2	1.1*	0.9	1.5	0.4*	0.1	0.9	0.6*	0.3	1.3	1.0*	0.8	1.2

MRR Mortality rate ratio, adjusted for location, sex, age group and year, CI Confidence interval, MRR Mortality rate ratio, TBI Traumatic brain injury

*P < 0.05