Fig. 6From: Non-invasive Vagus Nerve Stimulation (nVNS) as mini-prophylaxis for menstrual/menstrually related migraine: an open-label studyChange in Pain Intensity (ITT Population)a. Abbreviations: ITT, intention-to-treat; nVNS, non-invasive vagus nerve stimulation; SEM, standard error of the mean. aData are mean ± SEM; mean differences between treatment groups may not reflect calculated differences because of rounding; P values are from the t test; missing data were imputed using the last observation carried forwardBack to article page