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Table 3 Number of samples according to percentile categoriesa of measured and modeled PCE concentrations

From: Evaluation of the Webler-Brown model for estimating tetrachloroethylene exposure from vinyl-lined asbestos-cement pipes

  Measured PCE concentration
   ≤ 50th percentile > 50–75th percentile > 75th percentile Total
Model estimated PCE concentration ≤ 50th percentile 28 10 6 44
  > 50–75th percentile 12 7 3 22
  > 75th percentile 5 4 13 22
  Total 45 21 22 88
  1. a 207 μg/L and 657 ug/L were the 50th and 75th percentile modeled PCE concentrations, respectively. 0.5 μg/L and 32 ug/L were the 50th and 75th percentile measured PCE concentrations, respectively.