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Evidence found and GRADE certainty

57 questions · 60 findings · 21 reviews · Pregnancy and Childbirth

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No studies found 3 · 5%GRADE not reported 4 · 6.7%Very low 4 · 6.7%Low 24 · 40%Moderate 15 · 25%High 10 · 16.7%

Intervention not reported

Preterm birth less than 34 weeks' gestation · women undergoing home monitoring for preventing preterm birth versus women receiving standard care

The intervention leads to lower preterm birth less than 34 weeks' gestation (high certainty).

1 finding from 1 review

Intervention not reported

Preterm birth less than 37 weeks' gestation · women undergoing home monitoring for preventing preterm birth versus women receiving standard care

It is very uncertain whether the intervention changes preterm birth less than 37 weeks' gestation (very low certainty).

1 finding from 1 review

Intervention not reported

Any preterm birth (birth < 37 weeks) · women with a previous stillbirth of > 20 weeks' gestation who are pregnant or considering a subsequent pregnancy

It is very uncertain whether the intervention changes any preterm birth (birth < 37 weeks) (very low certainty).

1 finding from 1 review

Intervention not reported

Any preterm birth (birth < 37 weeks) · women with a previous stillbirth of ≥ 20 weeks' gestation who are pregnant or considering a subsequent pregnancy

The intervention showed no clear difference in any preterm birth (birth < 37 weeks) (low certainty).

1 finding from 1 review

Setting of BP measurement: self‐measurement vs conventional clinic measurement

Preterm birth less than 34 weeks' gestation · pregnant women with chronic or gestational hypertension

Setting of BP measurement: self‐measurement showed no clear difference in preterm birth (birth before 34 completed weeks' gestation) compared with conventional clinic measurement (low certainty).

1 finding from 1 review

Any supplements containing iron and folic acid vs same supplements without iron nor folic acid (no iron nor folic acid or placebo)

Preterm birth · pregnant women

(Infant outcomes) Any supplements containing iron and folic acid showed no clear difference in preterm birth (less than 37 weeks of gestation) (ALL) compared with same supplements without iron nor folic acid (no iron nor folic acid… (low certainty).

1 finding from 1 review

Any supplements containing iron vs same supplements without iron or no treatment/placebo (no iron or placebo)

Preterm birth · pregnant women

(Infant outcomes) Any supplements containing iron showed no clear difference in preterm birth (less than 37 weeks of gestation) (ALL) compared with same supplements without iron or no treatment/placebo (no iron or… (moderate certainty).

1 finding from 1 review

Planned early birth vs expectant management

Admission to neonatal intensive care unit · preterm prelabour rupture of membranes (PPROM)

Planned early birth probably leads to higher admission to neonatal intensive care compared with expectant management (moderate certainty).

1 finding from 1 review

Planned early birth vs expectant management

Length of maternal hospital stay (days) · preterm prelabour rupture of membranes (PPROM)

Planned early birth showed no clear difference in length of hospital stay (maternal) compared with expectant management (moderate certainty).

1 finding from 1 review

Intervention not reported

Preterm birth (before 37 weeks' gestation) · pregnant women considered to be at risk of developing pre‐eclampsia

The intervention leads to lower preterm birth (before 37 weeks' gestation) (high certainty).

1 finding from 1 review