AI Article Synopsis
- Water chlorination produces disinfection byproducts like trihalomethanes (THMs), which may be linked to mortality, yet research on this connection is limited.
- A study involving 6,720 adults aged 40 and older found a higher risk of all-cause mortality with increasing levels of chloroform (TCM) and total THMs in their blood.
- Those in the highest quartile of THM exposure had significantly increased risk ratios for overall mortality, with a specific connection between brominated THMs and cancer deaths, while TCM was related to other causes of death.
Article Abstract
Water chlorination can lead to the formation of disinfection byproducts, including trihalomethanes (THMs). However, few epidemiologic studies have explored associations between THM exposure and mortality. This study included 6720 adults aged ≥40 years from the National Health and Nutrition Examination Survey 1999-2012 who had blood THM concentrations quantified. A higher risk of all-cause mortality was found across increasing quartile concentrations of blood chloroform (TCM) and total THMs (TTHMs; sum of all four THMs) (both p for trend = 0.02). Adults in the highest quartile of TCM and TTHM concentrations had hazard ratios (HRs) of 1.35 (95% confidence intervals: 1.05-1.74) and 1.37 (1.05-1.79), respectively, for all-cause mortality, compared with adults in the lowest quartile. When cause-specific mortality was evaluated, a positive relationship was found between blood bromodichloromethane (BDCM), dibromochloromethane (DBCM), bromoform (TBM), total brominated THMs (Br-THMs; sum of BDCM, DBCM, and TBM), and TTHM concentrations and risk of cancer death and between blood TCM and TTHMs and risk of other cause (noncancer/nonheart disease) mortality. Our findings suggest that higher exposure to Br-THMs was associated with increased cancer mortality risk, whereas TCM was associated with a greater risk of noncancer/nonheart disease mortality.
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| http://dx.doi.org/10.1021/acs.est.1c00862 | DOI Listing |
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