Is Vaginal Progestogen Equivalent to Intramuscular Progestogen for Preventing Preterm Birth in High-Risk Women?
In this open-label, equivalence randomized trial of vaginal progestogen compared to intramuscular progestogens for preventing preterm birth in high-risk women, the difference in the risk of preterm birth at < 37 weeks of gestation between both groups was 3.1% (95% confidence interval, -7.6% to 13.8%), which was within the equivalence margin of 15% used in the study.
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