Bed rest v placebo or no intervention in women with singleton pregnancies at high risk of spontaneous preterm birth*
| Outcome | Bed rest | Placebo or no intervention | RRR (95% CI) | NNT |
|---|---|---|---|---|
| *Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article. | ||||
| Preterm birth (<37 wks) | 7.9% | 8.5% | 8% (−37 to 38) | Not significant |