Table 1

Environmental factors remained after Discriminant Analysis.

Year

Variable

Classification function coefficient

Eigenvalue

BG with WNV/BG without WNV

Grouping accuracy


2002

Percentage of agriculture

0.143

0.226

46/612

86.90%


Total length of streams

0.001


Total size of wetlands

0.001


Constant

-2.124


2003

Percentage of agriculture

0.126

0.202

35/623

84.80%


Total length of streams

0.001


Constant

-1.336


2004

Percentage of agriculture

0.154

0.201

25/633

84.80%


Percentage of water

0.037


Mean slope

1.908


DEM variation

0.049


Constant

-4.261


2005

Percentage of agriculture

0.232

0.24

36/622

90.30%


Total size of wetlands

0.001


Constant

-2.499


2006

Total size of wetlands

0.001

0.157

29/629

85.30%


Human population density

0.001


Constant

-2.141


2007

Percentage of agriculture

0.051

0.195

16/642

88.90%


Total length of streams

0.001


Percentage of water

0.205


Distance to the closest pollutant

0.001


Distance to the closest waste industry

0.003


Constant

-4.709


Their coefficients, eigenvalue, the numbers of census blockgroups with mosquito WNV cases and without WNV cases, and grouping accuracies.

Liu et al. International Journal of Health Geographics 2008 7:66   doi:10.1186/1476-072X-7-66

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