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. 2006 Jul 19;2006(3):CD003283. doi: 10.1002/14651858.CD003283.pub2

Comparison 2. Biphasic levonorgestrel/EE (preparation Beta) versus triphasic levonorgestrel/EE (preparation Gamma).

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Discontinuation due to medical reasons after 12 months 1 298 Peto Odds Ratio (Peto, Fixed, 95% CI) 1.54 [0.58, 4.09]