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Table 2 Relative risk for the occurrence of migraine on each day of the hormone free interval compared to the pooled risk of day 8–28

From: Migraine start, course and features over the cycle of combined hormonal contraceptive users with menstrual migraine – temporal relation to bleeding and hormone withdrawal: a prospective diary-based study

 Relative riskConfidence interval
Day 12.2860.992–5.269
Day 22.2860.992–5.269
Day 34.0001.850–8.648
Day 44.7142.210–10.055
Day 54.8572.282–10.336
Day 64.0001.850–8.648
Day 72.8571.276–6.396