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 risk
Confidence interval
Day 1
2.286
0.992–5.269
Day 2
Day 3
4.000
1.850–8.648
Day 4
4.714
2.210–10.055
Day 5
4.857
2.282–10.336
Day 6
Day 7
2.857
1.276–6.396