To the Editor There are many aspects of the study by Mr Di and colleagues1 that call into question their finding that air quality was associated with increased deaths: size of the effects, modeling bias, and flexibility of analysis. These methodological aspects are especially concerning given that recent large studies found no association between air quality and mortality.2,3
Young SS. Air Pollution and Mortality in the Medicare Population. JAMA. 2018;319(20):2135. doi:https://doi.org/10.1001/jama.2018.3927
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