Fig. 3

Cumulative incidence of four clinical outcomes between groups according to the history of headache disorders and gestational headaches. G-HA = gestational headache, Hx-HA = history of headache disorder. In a comparison between the four groups according to the presence or absence of G-HA and Hx-HA, the [G-HA ( +) & Hx-HA( +)] group showed the highest cumulative incidence rate in all types of stroke outcomes. The [G-HA ( +) & Hx-HA (-)] or the [G-HA (-) & Hx-HA ( +)] groups also showed higher cumulative incidence rates than the [G-HA (-) & Hx-HA (-)] group. However, in ischemic stroke, the [G-HA( +) & Hx-HA(-)] group showed no statistical difference from the [G-HA(-) & Hx-HA(-)] group