exposures and testosterone levels in 133 male Thai farmers. Urine and serum samples were
collected concurrently from participants. Urine was analyzed for levels of specific and
nonspecific metabolites of organophosphates (OPs), pyrethroids, select herbicides, and
fungicides. Serum was analyzed for total and free testosterone. Linear regression analyses
revealed significant negative relationships between total testosterone and the herbicide 2, 4 …