Fig. 3From: The role of purity and frequency in the classification of perimenstrual headacheComparison of migraine score between high-frequency and low-frequency perimenstrual headache; Migraine score: duration 4-72 h = 1, unilateral = 1, moderate to severe = 1, throbbing = 1, aggravation with activity = 1, nausea = 1, vomiting = 1, photophobia or phonophobia = 1; High frequency: headache at least two out of three menstrual cyclesBack to article page