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Grading of Recommendations, Assessment, Development and Evaluations (GRADE) scoring of the quality of evidence for the main outcomes
| Outcome | Pregnancy achieved | Miscarriage | Preterm delivery | Live births |
| Risk of bias | Strong | Strong | Moderate | Strong |
| Imprecision | Strong | Strong | Moderate | Strong |
| Inconsistency | Strong | Strong | Weak | Strong |
| Indirectness | Strong | Strong | Strong | Strong |
| Publication bias | Strong | Strong | Weak | Strong |
| Overall GRADE | High quality | High quality | Moderate quality | High quality |
