Table 3. HRs for dementia according to the frequency of hospital visits per month for epilepsy.

Frequency of hospital visits per month for epilepsy	Dementia	PY	Ratea	Adjusted HRb (95% CI)
Comparison cohort	96	20,627	4.65	1 (reference)
<1	50	5,424	9.22	2.07 (1.44–2.98)‡
≥1	25	639	39.15	11.20 (7.02–17.86)‡
p for trend				<0.001

CI, confidence interval; HR, hazard ratio; PY, person-years; Rate, incidence rate.

^aper 1,000 person-years.

^bCox regression models were corrected for age, sex, coronary artery disease, depression, chronic obstructive pulmonary disease, cancer, cerebrovascular disease, hypertension, head injury, liver disease, malnutrition, and autoimmune disease.

^‡p < 0.001.