The main effect of vitamin A supplementation was in height improvement ( P<0.05), and was only found in the model evaluating infants with any parasite. Growth velocity slopes, generated from the linear regression of individual child length, and height-for-age z-scores on time were analyzed as end points in regression models, adjusting for the presence of parasite infections Results: Monthly stool samples were screened for Giardia duodenalis, Ascaris lumbricoides and Entamoeba spp. ![]() Weight and length were measured once a month and morbidity histories were recorded twice a week for 12 months. Children aged 5–15 months were assigned to receive either a vitamin A supplement every 2 months (20 000 IU of retinol for infants ⩽ 1 year or 45 000 IU for infants >1 year), a daily supplement of 20 mg of zinc, a combined vitamin A–zinc supplement or a placebo, and were followed up for 1 year. We carried out a double-blind placebo-controlled trial to evaluate the effect of vitamin A and zinc supplementation on gastro-intestinal pathogen infections and growth among 584 infants in Mexico City. The efficacy of micronutrient supplementation on growth may be modified by specific gastrointestinal parasite infections Methods:
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