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

Chen, Ruey; Chien, Wu-Chien; Kao, Ching-Chiu; Chung, Chi-Hsiang; Liu, Doresses; Chiu, Huei-Ling; Chou, Kuei-Ru

doi:10.1186/s13195-018-0437-0

Alzheimer's Research & Therapy

Table 2 Injury in people with and without dementia

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

Variables	Total		People with dementia		People without dementia		p value
Variables	n	%	n	%	n	%	p value
Total	455,630		91,126	20.00	364,504	80.00
Injury							< 0.001
Without	368,734	80.93	72,978	80.08	295,756	81.14
With	86,896	19.07	18,148	19.92	68,748	18.86
Injury diagnosis							< 0.001
Fracture	32,838	37.79	6374	35.12	26,464	38.49
Dislocation	826	0.95	182	1.00	644	0.94
Sprains and strains	1715	1.97	415	2.29	1300	1.89
Intracranial/internal injury	9694	11.16	2246	12.38	7448	10.83
Open wound	4504	5.18	1093	6.02	3411	4.96
Injury to blood vessels	51	0.06	6	0.03	45	0.07
Superficial injury/contusion	3494	4.02	826	4.55	2668	3.88
Crushing	185	0.21	28	0.15	157	0.23
Foreign body entering through orifice	1079	1.24	375	2.07	704	1.02
Burn	936	1.08	228	1.26	708	1.03
Injury to nerves and spinal cord	367	0.42	62	0.34	305	0.44
Poisoning	3897	4.48	901	4.96	2996	4.36
Others injury	27,310	31.43	5412	29.82	21,898	31.85
Cause of injury							< 0.001
Traffic	5888	10.44	647	5.86	5241	11.55
Poisoning (drugs/medicaments/biologicals)	816	1.45	212	1.92	604	1.33
Poisoning (solid and liquid substances/gases/vapors)	191	0.34	41	0.37	150	0.33
Surgical/medical care	137	0.24	30	0.27	107	0.24
Abnormal reaction of medical procedures	13,221	23.44	2424	21.97	10,797	23.79
Falls	27,075	48.00	5533	50.15	21,542	47.47
Burns and fires	64	0.11	10	0.09	54	0.12
Environment	216	0.38	33	0.30	183	0.40
Drowning	8	0.01	1	0.01	7	0.02
Suffocation	672	1.19	238	2.16	434	0.96
Other unintentional injuries	4717	8.36	1147	10.40	3570	7.87
Late effects	1324	2.35	314	2.85	1010	2.23
Adverse drug reaction	1331	2.36	281	2.55	1050	2.31
Suicide	580	1.03	82	0.74	498	1.10
Homicide/abuse	168	0.30	39	0.35	129	0.28
Intentionality of injury							0.018
Unintentional	55,660	98.67	10,911	98.90	44,749	98.62
Intentional	748	1.33	121	1.10	627	1.38

p value by Chi-square/Fisher exact test on category variables and t test on continue variables

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