Analysis of the risk and risk factors for injury in people with and without dementia: a 14-year, retrospective, matched cohort study

Table 5 Factors for injury subgroup stratified using Cox regression

Dementia	People with dementia			People without dementia			Ratio	Adjusted HR	95% CI	p value
Injury subgroup	Event	PYs	Rate (per 10⁵ PYs)	Event	PYs	Rate (per 10⁵ PYs)	Ratio	Adjusted HR	95% CI	p value
Injury diagnosis
Fracture	6374	142,971.64	4458.23	26,464	596,593.59	4435.85	1.005	0.992	0.965–1.020	0.573
Sprains and strains	415	142,971.64	290.27	1300	596,593.59	217.90	1.332	1.316	1.177–1.471	< 0.001
Intracranial/internal injury	2246	142,971.64	1570.94	7448	596,593.59	1248.42	1.258	1.204	1.148–1.263	< 0.001
Open wound	1093	142,971.64	764.49	3411	596,593.59	571.75	1.337	1.171	1.093–1.255	< 0.001
Foreign body entering through orifice	375	142,971.64	262.29	704	596,593.59	118.00	2.223	2.202	1.939–2.499	< 0.001
Burn	228	142,971.64	159.47	708	596,593.59	118.67	1.344	1.296	1.115–1.507	0.001
Poisoning	901	142,971.64	630.19	2996	596,593.59	502.18	1.255	1.206	1.118–1.300	< 0.001
Cause of injury
Traffic	647	142,971.64	452.54	5241	596,593.59	878.49	0.515	0.510	0.470–0.553	< 0.001
Poisoning (drugs/medicaments/biologicals)	212	142,971.64	148.28	604	596,593.59	101.24	1.465	1.485	1.268–1.739	< 0.001
Falls	5533	142,971.64	3870.00	21,542	596,593.59	3610.83	1.072	1.076	1.044–1.108	< 0.001
Suffocation	238	142,971.64	166.47	434	596,593.59	72.75	2.288	2.301	1.961–2.701	< 0.001
Suicide	82	142,971.64	57.35	498	596,593.59	83.47	0.687	0.670	0.530–0.848	0.001
Homicide/abuse	39	142,971.64	27.28	129	596,593.59	21.62	1.262	1.107	0.770–1.590	0.584
Intentionality of injury
Unintentional	10,911	142,971.64	7631.58	44,749	596,593.59	7500.75	1.017	1.018	1.007–1.040	0.009
Intentional	121	142,971.64	84.63	627	596,593.59	105.10	0.805	0.764	0.628–0.930	0.007

Adjusted for comorbidities (diabetes mellitus, hypertension, hyperlipidemia, cerebrovascular disease, chronic kidney disease, alcohol-related disease)
CI confidence interval, ER emergency room, HR hazard ratio, PYs person-years

ISSN: 1758-9193