Infection screening programme (ISP) v control in pregnant women*

OutcomesISPControlRRR (95% CI)NNT (CI)
*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.
Spontaneous preterm delivery (at <37 wk gestation)3.0%5.3%45% (25 to 59)43 (28 to 86)
Infants born preterm with birth weight ⩽2500 g1.7%3.5%52% (28 to 68)55 (36 to 115)
Late miscarriages0.39%0.72%46% (−25 to 76)Not significant