Higher Infant Blood Lead Levels with Longer Duration of Breastfeeding - 07/08/11
Abstract |
Objective |
To determine whether longer breastfeeding is associated with higher infant lead concentrations.
Study design |
Data were analyzed from 3 studies of developmental effects of iron deficiency in infancy: Costa Rica (1981-1984), Chile (1991-1996), and Detroit (2002-2003). The relation between duration of breastfeeding and lead levels was assessed with Pearson product-moment or partial correlation coefficients.
Results |
More than 93% of the Costa Rica and Chile samples was breastfed (179 and 323 breastfed infants, respectively; mean weaning age, 8-10 months), as was 35.6% of the Detroit sample (53 breastfed infants; mean weaning age, 4.5 months). Lead concentrations averaged 10.8 μg/dL (Costa Rica, 12-23 months), 7.8 μg/dL (Chile, 12 months), and 2.5 μg/dL (Detroit, 9-10 months). Duration of breastfeeding as sole milk source and total breastfeeding correlated with lead concentration in all samples (r values = 0.14-0.57; P values = .06-<.0001).
Conclusions |
Longer breastfeeding was associated with higher infant lead concentration in 3 countries, in 3 different decades, in settings differing in breastfeeding patterns, environmental lead sources, and infant lead levels. The results suggest that monitoring lead concentrations in breastfed infants be considered.
Le texte complet de cet article est disponible en PDF.Mots-clés : CDC, SES
Plan
| The study was supported by grants from the US National Institute of Child Health and Human Development (R01 HD14122, R37 HD31606, R01 HD33487, and P01 HD039386; to B.L.), and from the Chilean Fondo Nacional de Desarrollo Cientifico y Technológico (FONDECYT; 195-0772; to P.P.). The study sponsors had no role in the study design, collection, analysis, and interpretation of data, writing of the report, or decision to submit for publication. The authors declare no conflicts of interest. |
Vol 155 - N° 5
P. 663-667 - novembre 2009 Retour au numéro
Article précédent
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