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Iron Status Predicts Malaria Risk in Malawian Preschool Children

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Jonker, Femkje A. M., Calis, Job C. J., Hensbroek, Michael Boele van, Phiri, Kamija, Geskus, Ronald B., Brabin, Bernard and Leenstra, Tjalling (2012) 'Iron Status Predicts Malaria Risk in Malawian Preschool Children'. PLoS ONE, Vol 7, Issue 8, e42670.

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Abstract

Introduction

Iron deficiency is highly prevalent in pre-school children in developing countries and an important health problem in sub-Saharan Africa. A debate exists on the possible protective effect of iron deficiency against malaria and other infections; yet consensus is lacking due to limited data. Recent studies have focused on the risks of iron supplementation but the effect of an individual's iron status on malaria risk remains unclear. Studies of iron status in areas with a high burden of infections often are exposed to bias. The aim of this study was to assess the predictive value of baseline iron status for malaria risk explicitly taking potential biases into account.

Methods and materials

We prospectively assessed the relationship between baseline iron deficiency (serum ferritin <30 µg/L) and malaria risk in a cohort of 727 Malawian preschool children during a year of follow-up. Data were analyzed using marginal structural Cox regression models and confounders were selected using causal graph theory. Sensitivity of results to bias resulting from misclassification of iron status by concurrent inflammation and to bias from unmeasured confounding were assessed using modern causal inference methods.

Results and Conclusions

The overall incidence of malaria parasitemia and clinical malaria was 1.9 (95% CI 1.8–2.0) and 0.7 (95% CI 0.6–0.8) events per person-year, respectively. Children with iron deficiency at baseline had a lower incidence of malaria parasitemia and clinical malaria during a year of follow-up; adjusted hazard ratio's 0.55 (95%-CI:0.41–0.74) and 0.49 (95%-CI:0.33–0.73), respectively. Our results suggest that iron deficiency protects against malaria parasitemia and clinical malaria in young children. Therefore the clinical importance of treating iron deficiency in a pre-school child should be weighed carefully against potential harms. In malaria endemic areas treatment of iron deficiency in children requires sustained prevention of malaria.

Item Type: Article
Subjects: QV Pharmacology > Hematologic Agents > QV 183 Iron. Iron compounds
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 750 Malaria
WS Pediatrics > WS 100 General works
Faculty: Department: Groups (2002 - 2012) > Child & Reproductive Health Group
Digital Object Identifer (DOI): https://doi.org/10.1371/journal.pone.0042670
Depositing User: Julie Franco
Date Deposited: 21 Jan 2013 11:12
Last Modified: 06 Feb 2018 13:05
URI: http://archive.lstmed.ac.uk/id/eprint/3218

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