Vitamin A supplementation and child mortality. A meta-analysis.
OBJECTIVE
A two-part meta-analysis of studies examining the relationship of vitamin A supplementation and child mortality.


METHODS
We identified studies by searching the MEDLARS database from 1966 through 1992 and by scanning Current Contents and bibliographies of pertinent articles.


METHODS
All 12 vitamin A controlled trials with data on mortality identified in the search were used in the analysis.


METHODS
Data were independently extracted by two investigators who also assessed the quality of each study using a previously described method.


RESULTS
We formally tested for heterogeneity across studies. We pooled studies using the Mantel-Haenszel and the DerSimonian and Laird methods and adjusted for the effect of cluster assignment of treatment groups in community-based studies. Vitamin A supplementation to hospitalized measles patients was highly protective against mortality (DerSimonian and Laird odds ratio, 0.39; 95% confidence interval, 0.22 to 0.66; P = .0004) (part 1 of the meta-analysis). Supplementation was also protective against overall mortality in community-based studies (DerSimonian and Laird odds ratio, 0.70; clustering-adjusted 95% confidence interval, 0.56 to 0.87; P = .001) (part 2 of the meta-analysis).


CONCLUSIONS
Vitamin A supplements are associated with a significant reduction in mortality when given periodically to children at the community level. Factors that affect the bioavailability of large doses of Vitamin A need to be studied further. Vitamin A supplements should be given to all measles patients in developing countries whether or not they have symptoms of vitamin A deficiency.
Fawzi
W W
WW
Department of Nutrition, Harvard School of Public Health, Boston, MA 02115.
Chalmers
T C
TC
Herrera
M G
MG
Mosteller
F
F
D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D008297:Male; D008457:Measles / Q000401:mortality* / Q000628:therapy; D014801:Vitamin A / Q000008:administration & dosage* / Q000627:therapeutic use; D014802:Vitamin A Deficiency / Q000401:mortality / Q000517:prevention & control
D014801:Vitamin A