TABLE 1--Summary statistics for land-use studies

 Parameter Type                                   Value

 NNH3      number of nonmissing values, P00608    1365.00
 NNO2      number of nonmissing values, P00613    1365.00
 NAON      number of nonmissing values, P00623    1352.00
 NNO3      number of nonmissing values, P00631    1365.00
 NP        number of nonmissing values, P00666    1352.00
 NPO4      number of nonmissing values, P00671    1365.00
 NWL       number of nonmissing values, P72019    1252.00
 MNH3      the mean, P00608                          0.12
 MNO2      the mean, P00613                          0.01
 MAON      the mean, P00623                          0.27
 MNO3      the mean, P00631                          4.89
 MP        the mean, P00666                          0.06
 MPO4      the mean, P00671                          0.05
 MWL       the mean, P72019                         36.11
 STDNH3    the standard deviation, P00608            0.74
 STDNO2    the standard deviation, P00613            0.03
 STDAON    the standard deviation, P00623            1.06
 STDNO3    the standard deviation, P00631            7.25
 STDP      the standard deviation, P00666            0.25
 STDPO4    the standard deviation, P00671            0.19
 STDWL     the standard deviation, P72019           59.19
 MEDNH3    the median, P00608                        0.02
 MEDNO2    the median, P00613                        0.01
 MEDAON    the median, P00623                        0.10
 MEDNO3    the median, P00631                        2.20
 MEDP      the median, P00666                        0.01
 MEDPO4    the median, P00671                        0.01
 MEDWL     the median, P72019                       15.44