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Evidence found and GRADE certainty

2 questions · 2 findings · 1 reviews · Headline outcomes only

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 1 · 50%Moderate 1 · 50%High 0 · 0%

Closest answers

The findings closest to your search, judged one by one by TypeSafe's Jev model.

  • Direct match · question page
    • (Infant outcomes) Any supplements containing iron vs same supplements without iron or no treatment/placebo (no iron or placebo) · Preterm birth (less than 37 weeks of gestation) (ALL)
      Daily oral iron supplementation during pregnancy 2015 · Cochrane Headline outcomes only
      RR 0.93 [0.84, 1.03]
      13 studies · 19286 participants
      Moderate
  • Direct match · question page
    • (Infant outcomes) Any supplements containing iron and folic acid vs same supplements without iron nor folic acid (no iron nor folic acid or placebo) · Preterm birth (less than 37 weeks of gestation) (ALL)
      Daily oral iron supplementation during pregnancy 2015 · Cochrane Headline outcomes only
      RR 1.55 [0.4, 6]
      3 studies · 1497 participants
      Low

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