Rate of hospitalisation ‐ not reported · children up to the age of 7 at risk of upper respiratory tract infection
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Maternal death · women in the postpartum period
Vitamin A supplementation (200,000 to 400,000 IU) showed no clear difference in maternal mortality compared with placebo or no treatment (moderate certainty).
1 finding from 1 review
Maternal morbidity (diarrhoea, respiratory infections, fever) · women in the postpartum period
1 finding from 1 review
Adverse effects on women: abdominal cramps · women in the postpartum period
Vitamin A supplementation (200,000 to 400,000 IU) showed no clear difference in maternal adverse effects after administration: abdominal pain compared with placebo or no treatment (low certainty).
1 finding from 1 review
Maternal breast milk retinol concentration · women in the postpartum period
1 finding from 1 review
Change in Infant Mortality Rate per 1000 live births1 · women in the postpartum period
Vitamin A supplementation (200,000 to 400,000 IU) showed no clear difference in infant mortality compared with placebo or no treatment (low certainty).
1 finding from 1 review
Infant morbidity (gastroenteritis) · women in the postpartum period
It is very uncertain whether vitamin A supplementation (200,000 to 400,000 IU) changes infant morbidity (gastroenteritis) compared with placebo or no treatment (very low certainty).
1 finding from 1 review
Infant adverse effects: bulging fontanelle · women in the postpartum period
Vitamin A supplementation (200,000 to 400,000 IU) showed no clear difference in infant adverse effects: bulging fontanelle compared with placebo or no treatment (low 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
Serum/plasma retinol (μmol/L) · general population over 2 years of age
1 finding from 1 review
All‐cause mortality · 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
All‐cause morbidity · 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
All‐cause mortality · 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
All‐cause morbidity · 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
Serum/plasma retinol (μmol/L) · general population over 2 years of age
1 finding from 1 review
Incidence of dementia ‐ not measured · MCI
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Cognitive function · MCI
1 finding from 1 review