Table 3

T-test statistics for climatic variables for year preceding occurrence. The table shows the t-test statistics for climatic variables (from year preceding WNV disease occurrence) in census blocks with and without WNV disease incidence. All of the t-tests used 'equal variance not assumed' version of test in SPSS.
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

DeGroote et al. International Journal of Health Geographics 2008 7:19   doi:10.1186/1476-072X-7-19

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