Question · asked by 1 review
A dose of vitamin D 4000 IU/d or more vs 3999 IU/d or less alone or with any other nutrient: Preterm birth
- Population
- women during pregnancy
- Intervention
- A dose of vitamin D 4000 IU/d or more
- Comparison
- 3999 IU/d or less alone or with any other nutrient
- Outcome
- Preterm birth
A dose of vitamin D 4000 IU/d or more showed no clear difference in preterm birth compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
What each review found
Current versions only| Finding | Effect | Studies | GRADE certainty |
|---|---|---|---|
A dose of vitamin D 4000 IU/d or more vs 3999 IU/d or less alone or with any other nutrient Preterm birth · women during pregnancy A dose of vitamin D 4000 IU/d or more showed no clear difference in preterm birth compared with 3999 IU/d or less alone or with any other nutrient (low certainty). Regimens of vitamin D supplementation for women during pregnancy (2019) · Cochrane Headline outcomes only | RR 0.85 [0.64, 1.12] | 6 studies · 2948 participants | Low |
Findings are shown side by side, never pooled across reviews.
The reviews
| Review | Searched up to | Included studies | AMSTAR 2 |
|---|---|---|---|
| Regimens of vitamin D supplementation for women during pregnancy 2019 · 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.