Maternal iron‐deficiency anaemia at term (Hb less than 110 g/L and at least 1 additional laboratory indicators at 37 weeks' gestation or more) · Women receiving supplements in pregnancy
It is very uncertain whether any intermittent iron regimen (with or without other vitamins and… changes maternal iron‐deficiency anaemia at term (Hb less than 110 g/L and… compared with daily regimen (with same vitamins and minerals)‐maternal outcomes (very low certainty).
1 finding from 1 review
Maternal death · Women receiving supplements in pregnancy
Any intermittent iron regimen (with or without other vitamins and… led to lower maternal death (death while pregnant or within 42 days of… compared with daily regimen (with same vitamins and minerals)‐maternal outcomes; GRADE not reported.
1 finding from 1 review
Any adverse effects · pregnant women
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Maternal adverse events · pregnant women and their infants..
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Preterm birth · pregnant women and their infants..
Vitamin D + calcium supplementation may leads to higher preterm birth (less than 37 weeks' gestation) compared with placebo or no intervention (low certainty).
1 finding from 1 review
Low birthweight · pregnant women and their infants..
It is very uncertain whether vitamin D + calcium supplementation changes low birthweight (less than 2500 g) compared with placebo or no intervention (very low certainty).
1 finding from 1 review
Pre‐eclampsia · pregnant women and their infants..
Vitamin D + calcium supplementation probably leads to lower pre‐eclampsia compared with placebo or no intervention (moderate certainty).
1 finding from 1 review
Gestational diabetes · pregnant women and their infants..
It is very uncertain whether vitamin D + calcium supplementation changes gestational diabetes compared with placebo or no intervention (very low certainty).
1 finding from 1 review
Pre‐eclampsia · women during pregnancy
A dose of vitamin D 601 IU or higher showed no clear difference in pre‐eclampsia compared with 600 IU or lower alone or with other nutrients (low certainty).
1 finding from 1 review
Gestational diabetes · women during pregnancy
A dose of vitamin D 601 IU or higher probably leads to lower gestational diabetes compared with 600 IU or lower alone or with other nutrients (moderate certainty).
1 finding from 1 review
Preterm birth · women during pregnancy
A dose of vitamin D 601 IU or higher showed no clear difference in preterm birth compared with 600 IU or lower alone or with other nutrients (low certainty).
1 finding from 1 review
Low birthweight · women during pregnancy
It is very uncertain whether A dose of vitamin D 601 IU or higher changes low birthweight compared with 600 IU or lower alone or with other nutrients (very low certainty).
1 finding from 1 review
Pre‐eclampsia · women during pregnancy
A dose of vitamin D 4000 IU/d or more showed no clear difference in pre‐eclampsia compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
1 finding from 1 review
Gestational diabetes · women during pregnancy
A dose of vitamin D 4000 IU/d or more showed no clear difference in gestational diabetes compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
1 finding from 1 review
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).
1 finding from 1 review
Low birthweight · women during pregnancy
A dose of vitamin D 4000 IU/d or more showed no clear difference in low birthweight compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
1 finding from 1 review
Intervention not reported
Stillbirth · All pregnant women receiving either vitamin C supplementation or control either in areas where there is inadequate dietary intake or where…
The intervention showed no clear difference in stillbirth (moderate certainty).
1 finding from 1 review
Intervention not reported
Intrauterine growth restriction · All pregnant women receiving either vitamin C supplementation or control either in areas where there is inadequate dietary intake or where…
The intervention showed no clear difference in intrauterine growth restriction (high certainty).
1 finding from 1 review
Intervention not reported
Preterm birth (< 37 weeks' gestation) · All pregnant women receiving either vitamin C supplementation or control either in areas where there is inadequate dietary intake or where…
The intervention showed no clear difference in preterm birth (< 37 weeks' gestation) (high certainty).
1 finding from 1 review
Intervention not reported
Preterm prelabour rupture of membranes · All pregnant women receiving either vitamin C supplementation or control either in areas where there is inadequate dietary intake or where…
The intervention showed no clear difference in preterm prelabour rupture of membranes (low certainty).
1 finding from 1 review