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. 2014 Jul 29;2014(7):CD004695. doi: 10.1002/14651858.CD004695.pub3

1.6. Analysis.

1.6

Comparison 1: 30 ug ethinyl estradiol and 150 ug levonorgestrel, 28‐day versus 91‐day cycles for one year, Outcome 6: Mean total bleeding days (bleeding + spotting) for entire study period (364 days)