Comparison 2. NA 1 mg / EE 20‐30‐35 µg versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Clinician assessment of no, minimal or mild acne at cycle 6	1	555	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.86 [1.32, 2.62]
2 Discontinuation due to any adverse event	1	593	Peto Odds Ratio (Peto, Fixed, 95% CI)	2.73 [1.26, 5.90]