Fig. 4

(a) Reduction in medication use and (b) ≥ 50% response in patients with CM by reversion to no MO. Values shown in part A are mean (SE) change from baseline over 12 weeks in the monthly average number of days of acute medication use in patients who reverted from MO to no MO (blue bars) and in those who did not revert from MO to no MO (green bars). Values shown in part B are the proportions of patients with a ≥ 50% response, defined as a ≥ 50% reduction in the monthly average number of headache days of at least moderate severity from baseline over 12 weeks, in patients who reverted from MO to no MO (blue bars) and in those who did not revert from MO to no MO (green bars). CM = chronic migraine; MO = medication overuse; SE = standard error