The threshold at which the correlation was maximized was 1 ppb (r =0.56, R2 = 0.31, p b 0.001), which agrees with Karagas et al. (2000).The data showno nail-As concentration differences based on age or gender,however as there were only 4 minors enrolled in the study, this dataset does not have the power to evaluate differences in nail concentrations
as a result of age.