Fig. 3From: Characteristics of menstrual versus non-menstrual migraine during pregnancy: a longitudinal population-based studyAssociation between menstrual migraine and headache frequency before-, during- and after pregnancy. Data shown represents that of Mentrual (MM) and Non-Menstrual Migraine (nMM) groups. Before pregnancy: 13 missing values; Week 17: 13 missing values; Week 32: 3 missing values; 8 weeks after delivery: 5 missing valuesBack to article page