the correlation coefficient and slope variable were considered when the
samples below certain thresholds were removed from the dataset. 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.