Effectiveness of daily and weekly iron supplementation in the prevention of anemia in infants.
OBJECTIVE
To evaluate the effectiveness of universal prophylactic targeting with iron sulfate on daily or weekly basis in the prevention of anemia in infants.


METHODS
Randomized clinical field trial with children between ages six and 12 months seen at primary health care units in the municipality of Rio de Janeiro, Brazil, between 2004 and 2005. Three concurrent cohorts were compared: daily group (n=150; 12.5mg Fe/day); weekly group (n=147; 25mg Fe/week) and control group. The intervention consisted of universal supplementation with iron sulfate for 24 weeks, combined with educational adherence-promoting measures.


RESULTS
mean serum hemoglobin concentration, distribution and prevalence of anemia (Hb<110.0 g/l) at age 12 months. Effectiveness was evaluated considering both intent to treat and adherence to protocol, using multiple regression analysis (linear and Poisson).


RESULTS
Groups were homogeneous in terms of descriptive variables. The intervention was implemented successfully, with high adhesion to protocol in both groups, and no statistical difference between them. After adjustment, only the daily regimen showed a protective effect. Adherence analysis demonstrated an evident dose-response effect on mean Hb and prevalence of anemia only for the daily regimen. No protective effect was detected for the weekly regimen.


CONCLUSIONS
Universal supplementation with iron sulfate from six to 12 months of age was effective in increasing serum Hb and decreasing risk of anemia only when administered on a daily basis.
Engstrom
Elyne Montenegro
EM
Escola Nacional de Saúde Pública Sérgio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil. engstrom@ensp.fi ocruz.br
Castro
Inês Rugani Ribeiro de
IR
Portela
Margareth
M
Cardoso
Letícia Oliveira
LO
Monteiro
Carlos Augusto
CA
D018798:Anemia, Iron-Deficiency / Q000517:prevention & control*; D001938:Brazil; D019587:Dietary Supplements; D005260:Female; D005296:Ferrous Compounds / Q000008:administration & dosage*; D006305:Health Status Indicators; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D007223:Infant; D019266:Iron, Dietary / Q000008:administration & dosage*; D008297:Male; D008423:Maternal Age; D009752:Nutritional Status; D010349:Patient Compliance; D010353:Patient Education as Topic; D012044:Regression Analysis; D012959:Socioeconomic Factors; D016896:Treatment Outcome
D005296:Ferrous Compounds; D006454:Hemoglobins; D019266:Iron, Dietary; C020748:ferrous sulfate