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Chlorination disinfection by-products in drinking water and congenital anomalies: review and meta-analyses

DOI: 10.1590/S1413-81232010000800015

Keywords: birth defects, congenital anomalies, disinfection by-products, fetal development, reproductive health, trihalomethanes.

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Abstract:

this study aims to review epidemiologic evidence of the association between exposure to chlorination disinfection by-products (dbps) and congenital anomalies. all epidemiologic studies that evaluated a relationship between an index of dbp exposure and risk of congenital anomalies were analyzed. for all congenital anomalies combined, the meta-analysis gave a statistically significant excess risk for high versus low exposure to water chlorination or tthm (17%; 95% ci, 3-34) based on a small number of studies. the meta-analysis also suggested a statistically significant excess risk for ventricular septal defects (58%; 95% ci, 21-107), but based on only three studies, and there was little evidence of an exposure-response relationship. it was observed no statistically significant relationships in the other meta-analyses and little evidence for publication bias, except for urinary tract defects and cleft lip and palate. although some individual studies have suggested an association between chlorination disinfection by-products and congenital anomalies, meta-analyses of all currently available studies demonstrate little evidence of such association.

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