To the Editor: Dr Lang and colleagues1 reported that higher levels of urinary bisphenol A (BPA) were associated with type 2 diabetes and cardiovascular diseases in a cross-sectional analysis of US National Health and Nutrition Examination Survey (NHANES) data. While these findings have public health importance, I am concerned about the classification of diabetes in this study, in which the authors combined self-reported diagnosed diabetes and borderline diabetes as a single group of diabetes.
Wei M. Association of Bisphenol A With Diabetes and Other Abnormalities. JAMA. 2009;301(7):720-722. doi:10.1001/jama.2009.120