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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Clinical episode | 1 | 85 | Risk Ratio (M‐H, Random, 95% CI) | 0.70 [0.50, 0.99] |
| 1.1 No history of OC | 1 | 38 | Risk Ratio (M‐H, Random, 95% CI) | 0.51 [0.25, 1.06] |
| 1.2 History of OC | 1 | 47 | Risk Ratio (M‐H, Random, 95% CI) | 0.77 [0.52, 1.13] |
