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Stepwise multiple regression, explanatory variables best-fit model (p £ 0.05) according to incidence rates, 1990-94, 1991-95, 1993-97 and 1994-98.

Step                 1                  2                  3                    4

Constant        105.2          182.8           185.2              182.7

Ave. Temp   0.026           0.055           0.130              0.171

T-Value          0.40             1.00            2.34                 3.07

P-Value         0.690            0.317         0.020             0.003

Elevation     -0.00128      0.00033      0.00050        0.00073

T-Value         -3.29             0.84              1.34              1.98

P-Value           0.001          0.402             0.183            0.050

Low Ave. Temp                 -0.93             -1.04           -1.05

T-Value                               -7.86             -8.94           -9.30

P-Value                                0.000            0.000          0.000

Water/Land Ratio                                     13.7             27.2

T-Value                                                       3.98             4.88

P-Value                                                      0.000           0.000

Water Area                                                               -0.00014

T-Value                                                                           -3.03

P-Value                                                                            0.003

S                            8.75          7.37             7.03                6.84

R-Sq                       6.79         34.25            40.64             44.15

R-Sq (adj)               5.53        32.92            39.02               42.24