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. 2017 Aug 2;2017(8):CD001324. doi: 10.1002/14651858.CD001324.pub5

Comparison 32.

High‐risk women versus low‐risk women (all hormonal methods)

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Observed number of pregnancies 11 19700 Risk Ratio (M‐H, Fixed, 95% CI) 2.67 [2.11, 3.39]