title: Water manganese exposure and children's intellectual function in Araihazar, Bangladesh.
abstract: Exposure to manganese via inhalation has long been known to elicit neurotoxicity in adults, but little is known about possible consequences of exposure via drinking water. In this study, we report results of a cross-sectional investigation of intellectual function in 142 10-year-old children in Araihazar, Bangladesh, who had been consuming tube-well water with an average concentration of 793 microg Mn/L and 3 microg arsenic/L. Children and mothers came to our field clinic, where children received a medical examination in which weight, height, and head circumference were measured. Children's intellectual function was assessed on tests drawn from the Wechsler Intelligence Scale for Children, version III, by summing weighted items across domains to create Verbal, Performance, and Full-Scale raw scores. Children provided urine specimens for measuring urinary As and creatinine and were asked to provide blood samples for measuring blood lead, As, Mn, and hemoglobin concentrations. After adjustment for sociodemographic covariates, water Mn was associated with reduced Full-Scale, Performance, and Verbal raw scores, in a dose-response fashion; the low level of As in water had no effect. In the United States, roughly 6% of domestic household wells have Mn concentrations that exceed 300 microg Mn/L, the current U.S. Environmental Protection Agency lifetime health advisory level. We conclude that in both Bangladesh and the United States, some children are at risk for Mn-induced neurotoxicity.
authors.affiliation: Department of Psychiatry, College of Physicians and Surgeons, Columbia University, and New York State Psychiatric Institute, New York, New York 10032, USA. wassermg@childpsych.columbia.edu
authors.forename: Gail A
authors.initials: GA
authors.lastname: Wasserman
authors.forename: Xinhua
authors.initials: X
authors.lastname: Liu
authors.forename: Faruque
authors.initials: F
authors.lastname: Parvez
authors.forename: Habibul
authors.initials: H
authors.lastname: Ahsan
authors.forename: Diane
authors.initials: D
authors.lastname: Levy
authors.forename: Pam
authors.initials: P
authors.lastname: Factor-Litvak
authors.forename: Jennie
authors.initials: J
authors.lastname: Kline
authors.forename: Alexander
authors.initials: A
authors.lastname: van Geen
authors.forename: Vesna
authors.initials: V
authors.lastname: Slavkovich
authors.forename: Nancy J
authors.initials: NJ
authors.lastname: LoIacono
authors.forename: Zhongqi
authors.initials: Z
authors.lastname: Cheng
authors.forename: Yan
authors.initials: Y
authors.lastname: Zheng
authors.forename: Joseph H
authors.initials: JH
authors.lastname: Graziano
mesh_terms: D001151:Arsenic / Q000097:blood / Q000652:urine; D001459:Bangladesh / Q000453:epidemiology; D002648:Child; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D007854:Lead / Q000097:blood; D008297:Male; D008345:Manganese / Q000032:analysis / Q000097:blood / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000097:blood / Q000633:toxicity*; D014881:Water Supply
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead; D008345:Manganese; D001151:Arsenic