title: Effectiveness of daily and weekly iron supplementation in the prevention of anemia in infants.
abstract: 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.
authors: Escola Nacional de Saúde Pública Sérgio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil. engstrom@ensp.fi ocruz.br
authors: Elyne Montenegro
authors: EM
authors: Engstrom
authors: Inês Rugani Ribeiro de
authors: IR
authors: Castro
authors: Margareth
authors: M
authors: Portela
authors: Letícia Oliveira
authors: LO
authors: Cardoso
authors: Carlos Augusto
authors: CA
authors: Monteiro
mesh_terms: 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
chemical_list: D005296:Ferrous Compounds; D006454:Hemoglobins; D019266:Iron, Dietary; C020748:ferrous sulfate