Strength of evidence for the outcomes of interest.

Abbreviations: IVH = intraventricular hemorrhage; MD = mean difference; N = number; N/A = not applicable; OR = odds ratio; RPTL = recurrent preterm labor; SoE = strength of evidence.*SoE domains are presented in the following order: Risk of Bias; Consistency; Directness; Precision.†RCT evidence was available for neonatal death [24], significant IVH [21], delivery [21], and pregnancy prolongation [21], [24]. There were no events of neonatal death or significant IVH. Nonsignificant differences were reported for incidence of delivery ‡These studies were not pooled. There was risk of double counting of participants across these studies.