RT Journal Article SR Electronic T1 Prevalence of migraine on each day of the natural menstrual cycle JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 351 OP 353 DO 10.1212/01.WNL.0000133134.68143.2E VO 63 IS 2 A1 MacGregor, E. Anne A1 Hackshaw, Allan YR 2004 UL http://n.neurology.org/content/63/2/351.abstract AB Diary data from 155 women were analyzed using within-woman analysis. Compared with all other times of the cycle, migraine was 1.7 times more likely to occur during the 2 days before menstruation and 2.1 times more likely to be severe and 2.5 times more likely to occur during the first 3 days of menstruation and 3.4 times more likely to be severe. This confirms that migraine at menstruation is different from nonmenstrual attacks, even within individuals.