Fig. 1From: Effects of onabotulinumtoxinA treatment in patients with and without allodynia: results of the COMPEL studyOnabotulinumtoxinA effect on (a) headache days and (b) moderate to severe headache days. *Indicates P < 0.001 for within-group change from baseline. P values shown in the figure indicate between-subgroup differences in change from baseline; data are observed dataBack to article page