153 Migraine attack incidence in relation to ovulation 7 Figure 3: Migraine incidence in the WHAT-hormone subgroup by day of the menstrual cycle with 95% confidence interval. Datapoints were standardized to 28 days and ovulation is fixed to day 14. Ovulation was determined with urine LHsurge tests. Data from 58 menstrual cycles of 31 women are shown.
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