Table 1.
Unadjusted incidence rate ratios (IRR) for the crude bivariate associations between human WNV and the landscape variables.
Table 2.
Adjusted incidence rate ratios (IRR) for the independent associations between human WNV and the landscape variables.
Table 3.
Instrumental variable analysis showing the association between WNV human cases and WNV bird deaths with precipitation and hydrogeographic area as the instruments are presented below.
Figure 1.
Map of the cumulative West Nile virus cases versus that which is predicted by climate and hydrogeography from the years 2000 to 2010.
The number of human WNV cases as graduated symbols are superimposed over the monochrome choropleth of cases predicted by temperature, precipitation and hydrogeographic area.