RT Journal Article T1 Association of blood trihalomethane concentrations with asthma in US adolescents: nationally representative cross-sectional study. A1 Sun, Yang A1 Xia, Peng-Fei A1 Xie, Jing A1 Mustieles, Vicente A1 Zhang, Yu A1 Wang, Yi-Xin A1 Messerlian, Carmen K1 Adolescent K1 Cross-Sectional Studies K1 Tobacco Smoke Pollution AB Population studies show that the use of swimming pools is associated with the risk of asthma and allergic diseases among children. Our objective was to explore the associations between blood trihalomethane (THM) concentrations and asthma among US adolescents, and assess to what extent the association is modified by active tobacco smoke exposure. We included 2359 adolescents aged 12-19 years with measured blood concentrations of chloroform (trichloromethane (TCM)), bromodichloromethane (BDCM), dibromochloromethane (DBCM) and bromoform (tribromomethane (TBM)) from the National Health and Nutrition Examination Survey 2005-2012. Logistic regression models were fitted to assess the odds ratios for the association of blood THM concentrations (three or four categories) with the risk of self-reported current and ever (lifetime) asthma. Blood DBCM concentrations were associated with a higher risk of ever asthma among all adolescents (OR 1.54 (95% CI 1.07-2.21), comparing the extreme exposure categories). The relationship was stronger among adolescents exposed to tobacco smoke (OR 3.96 (95% CI 1.89-8.30), comparing the extreme exposure categories). We also found positive relationships between blood brominated THM concentrations (sum of BDCM, DBCM and TBM) and risk of ever asthma and between blood DBCM and brominated THM concentrations and risk of current asthma among adolescents with tobacco smoke exposure. The relative excess risk of ever asthma due to the interaction between high blood DBCM and brominated THM concentrations and tobacco smoke exposure was 1.87 (95% CI 0.30-3.43) and 0.78 (95% CI 0.07-1.49), respectively. Exposure to THMs is associated with a higher risk of asthma in adolescents, particularly among those exposed to tobacco smoke. PB European Respiratory Society YR 2021 FD 2021-09-29 LK http://hdl.handle.net/10668/20254 UL http://hdl.handle.net/10668/20254 LA en NO Sun Y, Xia PF, Xie J, Mustieles V, Zhang Y, Wang YX, et al. Association of blood trihalomethane concentrations with asthma in US adolescents: nationally representative cross-sectional study. Eur Respir J. 2022 May 26;59(5):2101440. DS RISalud RD Apr 9, 2025