Variable | WNV Occurrence Year | Degrees of Freedom | With WNV Mean | Without WNV Mean | t-value | P |
---|---|---|---|---|---|---|
Precipitation | 2002 | 54 | 887 | 879 | 0.56 | 0.58 |
 | 2003 | 145 | 693 | 767 | -8.19 | <0.001 |
 | 2004 | 23 | 702 | 761 | -4.27 | <0.001 |
 | 2005 | 35 | 819 | 848 | -2.13 | 0.041 |
 | 2006 | 35 | 712 | 698 | 0.74 | 0.464 |
Dewpoint | 2002 | 54 | 4.83 | 4.87 | -0.37 | 0.71 |
 | 2003 | 140 | 3.97 | 4.43 | -6.01 | <0.001 |
 | 2004 | 22 | 3.04 | 3.41 | -2.22 | 0.037 |
 | 2005 | 35 | 4.29 | 4.61 | -2.36 | 0.024 |
 | 2006 | 35 | 4.71 | 4.74 | -0.23 | 0.818 |
Max. Temp. | 2002 | 54 | 15.4 | 15.3 | -0.57 | 0.57 |
 | 2003 | 140 | 15.7 | 15.7 | 0.31 | 0.76 |
 | 2004 | 22 | 14.8 | 15.1 | -1.88 | 0.074 |
 | 2005 | 35 | 15.1 | 15.2 | -0.68 | 0.5 |
 | 2006 | 35 | 15.8 | 15.8 | 0.07 | 0.94 |
Min. Temp. | 2002 | 54 | 3.93 | 4.02 | -0.57 | 0.57 |
 | 2003 | 143 | 3.32 | 3.84 | -5.48 | <0.001 |
 | 2004 | 23 | 2.58 | 3.07 | -2.47 | 0.021 |
 | 2005 | 35 | 3.18 | 3.68 | -2.97 | 0.005 |
 | 2006 | 35 | 3.77 | 4.04 | -1.48 | 0.147 |