Fig. 4

Scatter plots of the causal impact of dementia on migraine. The scatter plots show the causal effects of any dementia (A), Alzheimer’s disease (B), vascular dementia (C), frontotemporal dementia (D), dementia with lewy bodies (E) on migraine, when five types of dementia are the risk factors. Three lines reveal the estimated effect sizes by MR methods (IVW, MR-Egger and weighted median)