Health economics · healthy participants or recruited among the general population; individuals diagnosed with a specific disease in a stable phase or with…
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Vitamin A deficiency · children aged between 6 months and 5 years
Vitamin A supplementation probably leads to lower vitamin A deficiency compared with placebo or usual care (moderate certainty).
1 finding from 1 review
Maternal vitamin D concentration at term (25‐hydroxyvitamin D) (nmol/L) (ALL) · pregnant women
Meta-analysis of randomised trials of vitamin D supplementation for Maternal vitamin D concentrations at term: WMD 47.08 (95% CI 23.76 to 70.39), statistically significant. Umbrella review outcome-level evidence grade: Probable.
1 finding from 1 review
WMD 47.08 [23.76, 70.39]
4 studies
GRADE not reported
Serum 25-hydroxyvitamin D level · people with sickle cell disease
1 finding from 1 review
Nutritional rickets‐ biochemical · term breastfed infants to prevent vitamin D deficiency and improve bone health
1 finding from 1 review
Hypercalcaemia · term breastfed infants to prevent vitamin D deficiency and improve bone health
Vitamin D given to infants showed no clear difference in adverse effect (hypercalcaemia) compared with vitamin D given to lactating mothers (low certainty).
1 finding from 1 review
Total fetal loss (including miscarriages or combined miscarriages and stillbirths) · pregnant women
Vitamin A plus iron plus folate showed no clear difference in total fetal loss (including miscarriages or combined miscarriages… compared with iron plus folate (low certainty).
1 finding from 1 review
Early or late miscarriage · pregnant women
Vitamin A plus iron plus folate showed no clear difference in early or late miscarriage ‐ Vitamin A + iron + folate versus iron +… compared with iron plus folate (low certainty).
1 finding from 1 review
Stillbirth ‐ Vitamin A + iron + folate versus iron + folate · pregnant women
Vitamin A plus iron plus folate showed no clear difference in stillbirth ‐ Vitamin A + iron + folate versus iron + folate compared with iron plus folate (low certainty).
1 finding from 1 review
Vitamin A deficiency · mortality and morbidity in term neonates
Neonatal vitamin A supplementation showed no clear difference in vitamin A deficiency (serum retinol < 0.70 micromol/L) at 6 weeks of… compared with control (high certainty).
2 findings from 1 review
Early or late miscarriage · pregnant women
Multivitamin plus iron plus folate showed no clear difference in early or late miscarriage ‐ Multivitamin + iron + folic acid versus… compared with iron plus folate (moderate certainty).
1 finding from 1 review
Stillbirth ‐ Multivitamin + iron + folic acid versus iron + folic acid · pregnant women
Multivitamin plus iron plus folate leads to lower stillbirth ‐ Multivitamin + iron + folic acid versus iron + folic acid compared with iron plus folate (high certainty).
1 finding from 1 review
Total fetal loss (including miscarriages or combined miscarriages and stillbirths) · pregnant women
Multivitamin plus iron plus folate showed no clear difference in total fetal loss (including miscarriages or combined miscarriages… compared with iron plus folate (high certainty).
1 finding from 1 review
Subclinical vitamin A deficiency (serum/plasma retinol 70 μmol/L or less) · general population over 2 years of age
It is very uncertain whether staple foods fortified with vitamin A changes subclinical vitamin A deficiency (serum/plasma retinol 70 μmol/L or… compared with same unfortified staple foods (very low certainty).
1 finding from 1 review
Clinical vitamin A deficiency (as defined by night blindness) · general population over 2 years of age
It is very uncertain whether staple foods fortified with vitamin A changes clinical vitamin A deficiency (defined as night blindness) compared with same unfortified staple foods (very low certainty).
1 finding from 1 review
Any adverse effects (e.g. hypervitaminosis A, as defined by the trialists) · general population over 2 years of age
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Neuropathy due to vitamin E deficiency · adults and children with cystic fibrosis
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Retinopathy due to vitamin E deficiency · adults and children with cystic fibrosis
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Vitamin E total lipid ratio · adults and children with cystic fibrosis
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Vitamin E levels in serum: umol/L · adults and children with cystic fibrosis
1 finding from 1 review
no estimate extracted
6 participants
GRADE not reported