Fig. 4From: The role of purity and frequency in the classification of perimenstrual headacheComparison of migraine score between pure and impure 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; Pure: no headache at other times except for -2 to +3 of menstruationBack to article page