Any supplements containing iron and folic acid vs same supplements without iron nor folic acid (no iron nor folic acid or placebo): Preterm birth
- Population
- pregnant women
- Intervention
- Any supplements containing iron and folic acid
- Comparison
- same supplements without iron nor folic acid (no iron nor folic acid or placebo)
- Outcome
- Preterm birth
(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).
What each review found
Include earlier review versions| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
(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) · Pregnant women of any gestational age and parity (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). Daily oral iron supplementation during pregnancy (2015) · Cochrane Headline outcomes only | RR 1.55 [0.4, 6] | 3 studies · 1497 participants | Low |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Daily oral iron supplementation during pregnancy 2015 · Cochrane Headline outcomes only | Not reported | Not extracted | Not assessed |
How reviews are matched to this question
Reviews word the same question differently. Four decision models (TypeSafe's Jev, Liquid AI's d1-ultra, SubQ Snap and Baseten's Elephant) judged each wording of the population, intervention, comparator and outcome against the others; two wordings count as the same when at least three of them agree and none clearly disagrees, and findings count as this question only when all four elements match. Timing, setting and subgroup never split a question: they are shown on each finding.