Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

234 questions · 236 findings · 33 reviews · Pregnancy and Childbirth

No studies found 20 · 8.5%GRADE not reported 12 · 5.1%Very low 63 · 26.7%Low 82 · 34.7%Moderate 40 · 16.9%High 19 · 8.1%

Antibiotics vs placebo or no antibiotic

Definite early‐onset neonatal sepsis ‐ Early induction of labour · pregnant women with prelabour rupture of membranes at or near term

Any antibiotic showed no clear difference in definite early‐onset neonatal sepsis ‐ Early induction of labour compared with placebo or no antibiotic (subgrouped by timing of induction of labour) (low certainty).

1 finding from 1 review

Antibiotics vs placebo or no antibiotic

Definite early‐onset neonatal sepsis ‐ Late induction of labour · pregnant women with prelabour rupture of membranes at or near term

It is very uncertain whether any antibiotic changes definite early‐onset neonatal sepsis ‐ Late induction of labour compared with placebo or no antibiotic (subgrouped by timing of induction of labour) (very low certainty).

1 finding from 1 review

Antibiotics vs placebo or no antibiotic

Maternal infectious morbidity (chorioamnionitis and/or endometritis) ‐ Early induction of labour · pregnant women with prelabour rupture of membranes at or near term

Any antibiotic showed no clear difference in maternal infectious morbidity (chorioamnionitis and/or endometritis)… compared with placebo or no antibiotic (subgrouped by timing of induction of labour) (low certainty).

1 finding from 1 review

Calcium supplementation/fortification vs placebo (outcomes

Pre‐eclampsia · women who are not yet pregnant and women in the early stages of pregnancy

Calcium supplementation showed no clear difference in pre‐eclampsia compared with placebo (maternal outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium supplementation/fortification vs placebo (outcomes

Pre‐eclampsia, or pregnancy loss, or stillbirth (or combination) at any gestational age · women who are not yet pregnant and women in the early stages of pregnancy

Calcium supplementation showed no clear difference in pre‐eclampsia, or pregnancy loss, or stillbirth (or combination) at… compared with placebo (maternal outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium supplementation/fortification vs placebo (outcomes

Severe maternal morbidity and mortality index · women who are not yet pregnant and women in the early stages of pregnancy

Calcium supplementation showed no clear difference in severe maternal morbidity and mortality index compared with placebo (maternal outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium supplementation/fortification vs placebo (outcomes

Pregnancy loss or stillbirth at any gestational age · women who are not yet pregnant and women in the early stages of pregnancy

Calcium supplementation showed no clear difference in pregnancy loss or stillbirth at any gestational age compared with placebo (maternal outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium supplementation/fortification vs placebo (outcomes

Caesarean section · women who are not yet pregnant and women in the early stages of pregnancy

Calcium supplementation showed no clear difference in caesarean section compared with placebo (maternal outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium vs placebo (offspring outcomes) commencing before or early

Low birthweight · women who are not yet pregnant and women in the early stages of pregnancy

Calcium showed no clear difference in birthweight < 2500 g compared with placebo (offspring outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium vs placebo (offspring outcomes) commencing before or early

Apgar score less than 7 at 5 minutes · women who are not yet pregnant and women in the early stages of pregnancy

It is very uncertain whether calcium changes apgar < 7 at 5 minutes compared with placebo (offspring outcomes) commencing before or early (very low certainty).

1 finding from 1 review

Calcium vs placebo (offspring outcomes) commencing before or early

Perinatal death, or NICU admission for > 24 hours (or both) · women who are not yet pregnant and women in the early stages of pregnancy

Calcium showed no clear difference in perinatal death, or NICU admission for > 24 hours (or both) compared with placebo (offspring outcomes) commencing before or early (low certainty).

1 finding from 1 review

Calcium vs placebo (offspring outcomes) commencing before or early

Pregnancy loss, stillbirth or neonatal death before discharge · women who are not yet pregnant and women in the early stages of pregnancy

Calcium showed no clear difference in pregnancy loss, stillbirth or NND before discharge compared with placebo (offspring outcomes) commencing before or early (low certainty).

1 finding from 1 review

LMWH prophylaxis vs UFH

Adverse effects sufficient to stop treatment · pregnant women at increased risk of VTE during pregnancy and the early postnatal period

It is very uncertain whether antenatal (± postnatal) prophylaxis: LMWH changes adverse effects sufficient to stop treatment compared with UFH (very low certainty).

1 finding from 1 review

Heparin prophylaxis vs no treatment/placebo

Symptomatic thromboembolic events ( · pregnant women at increased risk of VTE during pregnancy and the early postnatal period

It is very uncertain whether antenatal (± postnatal) prophylaxis: heparin (LMWH or UFH) changes symptomatic thromboembolic events ( compared with no treatment/placebo (very low certainty).

1 finding from 1 review