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High exposure to perfluorinated compounds in drinking water and thyroid disease. A cohort study from Ronneby, Sweden.

Journal article
Authors Eva M. Andersson
K Scott
Yiyi Xu
Ying Li
Daniel S Olsson
T Fletcher
Kristina Jakobsson
Published in Environmental research
Volume 176
Pages 108540
ISSN 1096-0953
Publication year 2019
Published at Institute of Medicine, School of Public Health and Community Medicine
Institute of Medicine, Department of Internal Medicine and Clinical Nutrition
Pages 108540
Language en
Subject categories Environmental medicine


Per- and polyfluoroalkyl substances (PFAS) are extremely persistent manmade substances. Apart from exposure through food and indoor air and dust, humans can be exposed through drinking water if the surface or groundwater is contaminated. In 2013 very high levels of PFOS and PFHxS were found in the drinking water from one of the two waterworks supplying the municipality of Ronneby, Sweden. A cohort was formed, including all individuals who had lived at least one year in Ronneby during the period 1980-2013 (ñ63,000). Each year, addresses that got their drinking water from the contaminated water works were identified. Through the Swedish personal identity number, each individual was linked to registers providing diagnoses and prescriptions for hyper- and hypothyroidism. In total, 16,150 individuals had ever been exposed. The hazard ratios did not indicate any excess risk of hyperthyroidism among those with contaminated water. For hypothyroidism, the risk of being prescribed medication was significantly increased among women with exposure during the mid part of the study period (but not men). However, the association with period of exposure was non-monotonic, so the significance is considered to be a chance finding. Our research was limited by the relatively simple exposure assessment.

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