Risk Factors for Chronic Subdural Hematoma after a Minor Head Injury in the Elderly: A Population-Based Study

Table 1

Baseline characteristics of the study subjects.

Variables	Patients with minor head injury		Control		value
		%		%
Gender					1.000
Female	7023	50.1	7023	50.1
Male	7003	49.9	7003	49.9
Age					0.416
≤75	7,456	53.2	7,524	53.6
>75	6,570	46.8	6,502	46.4
Comorbidity
DM	5,074	36.2	4,496	32.1	<0.001
Hypertension	10,550	75.2	9,852	70.2	<0.001
Chronic kidney disease	1,296	9.2	1,038	7.4	<0.001
Chronic liver disease	3,495	24.9	3,024	21.6	<0.001
Rheumatic heart disease	489	3.5	380	2.7	<0.001
Ischemic heart disease	6,571	46.8	5,647	40.3	<0.001
Af/AF	749	5.3	676	4.8	0.047
Heart failure	2,677	19.1	2,206	15.7	<0.001
Peripheral artery occlusion	76	0.5	51	0.4	0.026
Deep vein thrombosis	337	2.4	283	2.0	0.028
Hydrocephalus	214	1.5	75	0.5	<0.001
Subdural hematoma	254	1.8	93	0.7	<0.001
Followup year (mean ± SD)	4.39 ± 3.18		4.68 ± 3.15