Exposure of the U.S. Population to Bisphenol A and 4- <i>tertiary</i> -Octylphenol: 2003–2004

Urine concentrations of total BPA differed by race/ethnicity, age, sex, and household income. These first U.S. population representative concentration data for urinary BPA and tOP should help guide public health research priorities, including studies of exposure pathways, potential health effects, and risk assessment.