Incidence of pneumonia Defined as patient admitted to hospital with a diagnosis of pneumonia Dose: 2 g per day · school‐aged children (6 to 15 years) and marine corps recruits (mean age 18.5 years)
It is very uncertain whether vitamin C changes incidence of pneumonia Defined as patient admitted to hospital with… compared with placebo (very low certainty).
1 finding from 1 review
Prevalance of pneumonia · school‐aged children (6 to 15 years) and marine corps recruits (mean age 18.5 years)
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Mortality (pneumonia-associated) · school‐aged children (6 to 15 years) and marine corps recruits (mean age 18.5 years)
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Adverse effects (urticaria) Defined as participants reporting urticaria (hives) Dose: 2 g per day · school‐aged children (6 to 15 years) and marine corps recruits (mean age 18.5 years)
It is very uncertain whether vitamin C changes adverse effects (urticaria) Defined as participants reporting… compared with placebo (very low certainty).
1 finding from 1 review
Duration of illness · children under 5 years of age
1 finding from 1 review
no estimate extracted
Studies not reported
Very low
Clinical cure · children under 5 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
Mortality (pneumonia-associated) · children under 5 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
Adverse effects · children under 5 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
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
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