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The number of days with migraine per four weeks in each group across all treatment time points (mean and SE). Tw4, Tw8, Tw12, Tw16, and Tw20 correspond to the treatment weeks 1–4, weeks 5–8, weeks 9–12, weeks 13–16, and weeks 17–20, respectively; Pw4, 8, and 12 correspond to the posttreatment weeks 1–4, weeks 5–8, and weeks 9–12; ∗ indicated that at that point in time the significant difference between two groups was detected.
