Table 3.

Risk of each type of dementia in the migraine cohort and matched controls

Variables	Subjects, No	cases, No	Person- Years, No	Incidence rate (95% CI) per 100,000 person years	Hazard ratio (95% CI)
Alzheimer’s dementia
Matched Controls	44,195	2,685	348,995	76.9 (74.1–79.8)	1.00
Migraine cohort	44,195	3,401	343,871	98.9 (95.6–102.2)	1.29 (1.23–1.35)
Vascular dementia
Matched Controls	44,195	408	348,995	11.7 (10.6–12.9)	1.00
Migraine cohort	44,195	544	343,871	15.8 (14.5–17.2)	1.35 (1.19–1.54)
Mixed, or other specified dementias
Matched Controls	44,195	75	348,995	2.1 (1.7–2.7)	1.00
Migraine cohort	44,195	100	343,871	2.9 (2.4–3.5)	1.36 (1.00–1.83)
Unspecified dementia
Matched Controls	44,195	589	348,995	16.9 (15.6–18.)	1.00
Migraine cohort	44,195	755	343,871	22.0 (20.4–23.6)	1.30 (1.17–1.45)