Intervention not reported
Fever after initiation of treatment ( · children with no influenza A infection (prevention) or with influenza A infection (treatment)
The intervention probably leads to lower fever after initiation of treatment ( (moderate certainty).
1 finding from 1 review
Intervention not reported
Cough after initiation of treatment ( · children with no influenza A infection (prevention) or with influenza A infection (treatment)
The intervention showed no clear difference in cough after initiation of treatment ( (moderate certainty).
1 finding from 1 review
Proportion of participants developing a cold Duration of · adults and children without colds
1 finding from 1 review
Proportion with improved global symptom severity Duration of · adults and children with colds and/or upper respiratory infections
1 finding from 1 review
Risk of adverse events, including those that may be due to zinc supplements Duration of · adults and children with colds and/or upper respiratory infections
1 finding from 1 review
Risk of serious adverse events, including those that may be complications of the common cold · adults and children with colds and/or upper respiratory infections
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Mean number of colds developed Duration of · adults and children without colds
1 finding from 1 review
Duration of cold symptoms (days) · adults and children without colds
1 finding from 1 review
Standardised mean global symptom severity Duration of · adults and children without colds
1 finding from 1 review
Risk of adverse events, including those that may be due to zinc supplements Duration of · adults and children without colds
1 finding from 1 review
Risk of serious adverse events, including those that may be complications of the common cold Duration of · adults and children without colds
1 finding from 1 review
Duration of cold symptoms (days) · adults and children with colds and/or upper respiratory infections
1 finding from 1 review
Risk of continuing colds at study end Duration of · adults and children with colds and/or upper respiratory infections
1 finding from 1 review
Standardised mean global symptom severity Duration of · adults and children with colds and/or upper respiratory infections
1 finding from 1 review
Incidence of acute URTIs during the study period (the number of acute URTIs over a period of time) · children up to the age of 7 at risk of upper respiratory tract infection
Summary of findings table ‐ Vitamin A supplements showed no clear difference in incidence of acute URTIs during the study period (the number of… compared with placebo (low certainty).
1 finding from 1 review
Incidence of acute URTIs during the study period (proportion of participants with an acute URTI) · children up to the age of 7 at risk of upper respiratory tract infection
1 finding from 1 review
Adverse events · children up to the age of 7 at risk of upper respiratory tract infection
1 finding from 1 review
Severity of subjective symptoms (mean duration of acute URTI) · children up to the age of 7 at risk of upper respiratory tract infection
1 finding from 1 review
Time to occurrence of acute URTI ‐ 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
Number of cases with complications ‐ 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