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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%
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Environmental Health

ISSN: 1476-069X