Further statistical analyses
migraine
MIGRAINE
We report continuous variables as means and standard deviations and categorical variables as frequencies. The (non-parametric) Mann–Whitney U Test analysed the influence of a dichotomous variable on a continuous variable. Except for the MRI data analysis (see above), we used IBM SPSS statistics version 25 for the calculations and set the significance level at 0.05. Missing data are indicated at each step; they were not imputed. We did not analyse the correlation between MMD and perfusion data as the variability of the migraine days was small (see results).