Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,315 questions · 23,557 findings · 2,311 reviews

No studies found 4,183 · 17.8%GRADE not reported 3,930 · 16.7%Very low 5,371 · 22.8%Low 5,787 · 24.6%Moderate 3,320 · 14.1%High 966 · 4.1%

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Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Maternal anaemia · pregnant women

It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal anaemia compared with placebo/no vitamin B12 supplementation (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Maternal vitamin B12 deficiency · pregnant women

It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal vitamin B12 deficiency compared with placebo/no vitamin B12 supplementation (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Vitamin B12 supplementation vs no supplementation or placebo

Low birthweight · pregnant women

Summary of findings table ‐ Vitamin B12 supplementation showed no clear difference in low birthweight (< 2500 g) compared with placebo/no vitamin B12 supplementation (low certainty).

1 finding from 1 review

Psychosocial interventions vs treatment

Number of continuously abstinent women ‐ total · stopping or reducing alcohol consumption during pregnancy

Summary of findings table ‐ Any psychosocial intervention may leads to higher number of continuously abstinent women ‐ total compared with treatment (low certainty).

1 finding from 1 review

Psychosocial interventions vs treatment

Number of women who completed treatment ‐ total · stopping or reducing alcohol consumption during pregnancy

Summary of findings table ‐ Any psychosocial intervention showed no clear difference in number of women who completed treatment ‐ total compared with treatment (moderate certainty).

1 finding from 1 review