What do we already know about this topic?

• Diagnosis of menstrually-related migraine is based upon a 5-day perimenstrual window (2 days prior to the start of menstruation and the first 3 days of bleeding).¹
• The odds of migraine increase around the perimenstrual window at the population level.^2,3
• Menstrual migraine research has overlooked between- and within-woman variation, which is critical for progressing clinical theory and practice.

How was this study conducted?

• A longitudinal study utilizing data from N1-Headache® digital platform on daily migraine and menstruation status from actively menstruating adult women with migraine over 90 days (N=203).
• Variables of primary interest were migraine day, and menstrual status (inside or outside the 5-day perimenstrual window).
• Data were analysed using three-level binary multilevel models.