Progesterone, cerclage, pessary, or acetylsalicylic acid for prevention of preterm birth in singleton and multifetal pregnancies - A systematic review and meta-analyses.

Front Med (Lausanne) · 2023 · PMC10015499 · PMID 36936217

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borderline significanceno p-value reported

This difference can occur when there is a borderline significance and is caused by (1) the difference in mathematical approximations when calculating CIs for RR and RD, respectively, and (2) the continuity corrections when calculating RR for trials with zero event-arms which is not done for RD.

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