Figure 1:
Urine concentrations of bisphenol A in reference populations from Canada, the United States, Germany and China. (A) Unadjusted geometric mean urine concentrations by age group. (B) Urine concentrations of bisphenol A were adjusted for creatinine level to control for differences in volume of urine output. No corrected values were reported for the German reference population. BPA = bisphenol A. The data in this figure are taken from Calafet et al.,13 Becker et al.,14 He et al.15 and Bushnik et al.16