Table 2.
Results from peak year analysis
| Land cover | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | All years | Total US |
|---|---|---|---|---|---|---|---|---|---|
| Developed, open space | − | − | − | − | − | − | − | − | − |
| Developed, low intensity | − | − | − | − | − | − | − | − | − |
| Developed, medium intensity | − | − | − | − | − | − | − | − | − |
| Developed, high intensity | − | − | − | − | − | − | − | − | − |
| Barren land | − | − | − | − | |||||
| Deciduous forest | − | − | − | − | − | − | |||
| Evergreen forest | − | − | − | − | − | ||||
| Mixed forest | − | − | − | − | − | − | |||
| Shrub | + | + | + | ||||||
| Grassland | + | + | + | + | + | + | + | ||
| Pasture | − | − | − | − | − | − | − | ||
| Crops | + | + | + | + | + | + | + | ||
| Woody wetland | − | − | − | − | − | ||||
| Herbaceous wetland | − | + | − | + |
All years refers to all peak year data, which excluded counties that had no reported WNV human disease cases. Total US refers to the results from the first analysis at the national extent, which did not exclude counties that had no reported WNV human disease cases. Cells marked with a minus sign are significantly negatively associated with the indicated land cover for that year. Cells marked with a plus sign are significantly positively associated with the indicated land cover for that year. Empty cells are not significantly associated with a land cover in either direction. Significance was determined if one test was significant and the other test did not disagree (i.e., was significant with the same sign or was not significant).