Sergio Valdés, Viyey Doulatram-Gamgaram, Cristina Maldonado-Araque, Ana Lago-Sampedro, Eva García-Escobar, Sara García-Serrano, Marta García-Vivanco, Luis Garrido Juan, Mark Richard Theobald, Victoria Gil, Fernando Martín-Llorente, Pilar Ocon, Alfonso Calle-Pascual, Luis Castaño, Elías Delgado, Edelmiro Menendez, Josep Franch-Nadal, Sonia Gaztambide, Joan Girbés, F Javier Chaves, José L Galán-García, Gabriel Aguilera-Venegas, Carolina Gutierrez-Repiso, José Carlos Fernández-García, Natalia Colomo, Federico Soriguer, Eduardo García-Fuentes, Gemma Rojo-Martínez
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Abstract
Background: Recent reports have suggested that air pollution may impact thyroid function, although the evidence is still scarce and inconclusive. In this study we evaluated the association of exposure to air pollutants to thyroid function parameters in a nationwide sample representative of the adult population of Spain.
Methods: The Di@bet.es study is a national, cross-sectional, population-based survey which was conducted in 2008-2010 using a random cluster sampling of the Spanish population. The present analyses included 3859 individuals, without a previous thyroid disease diagnosis, and with negative thyroid peroxidase antibodies (TPO Abs) and thyroid-stimulating hormone (TSH) levels of 0.1-20 mIU/L. Participants were assigned air pollution concentrations for particulate matter <2.5μm (PM2.5) and Nitrogen Dioxide (NO2), corresponding to the health examination year, obtained by means of modeling combined with measurements taken at air quality stations (CHIMERE chemistry-transport model). TSH, free thyroxine (FT4), free triiodothyronine (FT3) and TPO Abs concentrations were analyzed using an electrochemiluminescence immunoassay (Modular Analytics E170 Roche).
Results: In multivariate linear regression models, there was a highly significant negative correlation between PM2.5 concentrations and both FT4 (p<0.001), and FT3 levels (p<0.001). In multivariate logistic regression, there was a significant association between PM2.5 concentrations and the odds of presenting high TSH [OR 1.24 (1.01-1.52) p=0.043], lower FT4 [OR 1.25 (1.02-1.54) p=0.032] and low FT3 levels [1.48 (1.19-1.84) p=<0.001] per each IQR increase in PM2.5 (4.86 μg/m3). There was no association between NO2 concentrations and thyroid hormone levels. No significant heterogeneity was seen in the results between groups of men, pre-menopausal and post-menopausal women.
Conclusions: Exposures to PM2.5 in the general population were associated with mild alterations in thyroid function.
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