Fig. 2

Mean number of healthcare practitioner (HCP) visits during the previous 6 months (a; mean and SE), the percentage of reported healthcare visits (b), visits to emergency room (ER) (c) and reported inpatient days during the previous 12 months (d) stratified by mean monthly migraine days (MMDs). *p < 0.05, **p < 0.01, ***p < 0.001