Fig. 5

Change in MIDAS Migraine Disability (ITT Population)^a. Abbreviations: ITT, intention-to-treat; MIDAS, Migraine Disability Assessment; nVNS, non-invasive vagus nerve stimulation; SEM, standard error of the mean. MIDAS score (a) and MIDAS grade (b). ^aData are mean ± SEM; mean differences between treatment groups may not reflect calculated differences because of rounding; P values were from the t test; missing data were imputed using the last observation carried forward. ^bOne subject had missing MIDAS grade data for both the baseline and nVNS periods