Skip to main content

Table 2 Comparison of quartiles of the predicted nitrate concentration by quartiles of the measured nitrate concentrations, 77 wells used for the model validation

From: Modeled nitrate levels in well water supplies and prevalence of abnormal thyroid conditions among the Old Order Amish in Pennsylvania

Quartiles of the predicted nitrate concenytration  
Quartiles of measured nitrate concentration Q1 Q2 Q3 Q4 Total
   Q1 13 1 3 0 17
   Q2 3 11 6 0 20
   Q3 1 6 6 6 19
   Q4 1 2 5 13 21
   total 18 20 20 19 77
  1. Percent agreement = 56%