Fig. 2From: Efficacy and tolerability of pregabalin as preventive treatment for migraine: a 3-month follow-up studyReduction of mean number of days with headache per month with respect to the increase in the dose at the 1-month visit. p < 0.001 for patients who increased (n = 33) and p = 0.08 for those who did not increase (n = 14) the pregabalin dose within the first month of treatment (ANOVA)Back to article page