Table 2

T-test statistics for climatic variables for year of occurrence. The table shows the t-test statistics for climatic variables (in year of 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
 Year
 Degrees of Freedom
 With WNV Mean
 Without WNV Mean
 t-value
 P
Precipitation
 2002
 54
 768
 763
 -0.33
 0.74

2003
 140
 719
 762
 -5.63
 <0.001

2004
 22
 848
 850
 0.12
 0.901

2005
 35
 709
 698
 0.66
 0.515

2006
 35
 743
 779
 -2.9
 0.006
Dewpoint
 2002
 54
 4.35
 4.4
 0.50
 0.62

2003
 140
 3.16
 3.42
 -3.38
 <0.001

2004
 22
 4.61
 4.33
 -1.71
 0.1

2005
 35
 4.73
 4.74
 -0.10
 0.922

2006
 35
 4.86
 5.01
 -1.09
 0.283
Max. Temp.
 2002
 54
 15.7
 15.7
 -0.37
 0.71

2003
 140
 15.2
 15.1
 0.70
 0.483

2004
 22
 15.2
 14.8
 -1.86
 0.076

2005
 35
 15.7
 15.8
 -0.55
 0.583

2006
 35
 16.2
 16.1
 0.28
 0.783
Min. Temp.
 2002
 54
 3.71
 3.82
 0.66
 0.52

2003
 143
 2.73
 3.09
 -3.75
 <0.001

2004
 23
 3.17
 3.68
 -2.51
 0.02

2005
 35
 3.65
 4.04
 -2.74
 0.01

2006
 35
 4.29
 4.55
 -1.56
 0.128

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

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