Table 3. Crude and adjusted hazard ratios of hemorrhagic stroke during the two-year follow-up for the migraine subgroups.

	Migraine subgroups
	MA subgroup	MO subgroup	MU subgroup
Occurrence of HS	N = 1834	N = 3683	N = 15408
Yes, n (%)	10 (0.55)	18 (0.49)	85 (0.55)
No, n (%)	1824 (99.45)	3665 (99.51)	15323 (99.45)
Crude hazard ratio (95% CI)	2.24 (1.19 – 4.22)†	2.01 (1.25 – 3.25)†	2.26 (1.77 – 2.90)‡
Adjusted* hazard ratio (95% CI)	2.22 (1.18 – 4.18)†	1.74 (1.08 – 2.81)†	2.22 (1.74 – 2.84)‡

^*Variables included in the multiple regression analyses were age, sex, hypertension (with and without medication), diabetes, hyperlipidemia, coronary heart disease, chronic rheumatic heart disease, other heart disease, and the use of anticoagulant medication.

^†P<0.05; ^‡P<0.0001.

Abbreviations: HS, hemorrhagic stroke; MA, migraine with aura; MO, migraine without aura; MU, uncategorized migraine.