Table 4 Mann Whitney U test statistics for climatic variables broken by eastern and western regions. The table shows the Mann Whitney U test statistics for climatic variables in census block groups with and without WNV disease incidence for the year of occurrence broken into eastern and western regions. There were 24, 30, 11, 6, and 11 census block groups with WNV disease in the Eastern region in 2002, 2003, 2004, 2005, and 2006 respectively. There were 29, 99, 12, 29, and 24 census block groups with WNV disease in the Western region in 2002, 2003, 2004, 2005, and 2006 respectively.
Variable | Year/Region | With WNV Mean Rank | Without WNV Mean Rank | z-score | P |
|---|---|---|---|---|---|
Precipitation | 2002/East | 701 | 695 | -0.16 | 0.88 |
| Â | 2002/West | 776 | 619 | -2.31 | 0.021 |
| Â | 2003/East | 733 | 694 | -0.53 | 0.6 |
| Â | 2003/West | 465 | 637 | -4.57 | <0.001 |
| Â | 2004/East | 678 | 695 | -0.14 | 0.89 |
| Â | 2004/West | 626 | 623 | -0.23 | 0.98 |
| Â | 2005/East | 679 | 695 | -0.96 | 0.92 |
| Â | 2005/West | 623 | 624 | -0.01 | 0.99 |
| Â | 2006/East | 421 | 697 | -2.27 | 0.023 |
| Â | 2006/West | 526 | 625 | -1.35 | 0.18 |
Dewpoint | 2002/East | 708 | 695 | -0.74 | 0.94 |
| Â | 2002/West | 581 | 625 | -0.65 | 0.52 |
| Â | 2003/East | 747 | 694 | -0.71 | 0.48 |
| Â | 2003/West | 479 | 636 | -4.15 | <0.001 |
| Â | 2004/East | 516 | 696 | -1.49 | 0.14 |
| Â | 2004/West | 512 | 625 | -1.08 | 0.28 |
| Â | 2005/East | 547 | 695 | -0.91 | 0.37 |
| Â | 2005/West | 616 | 624 | -0.11 | 0.91 |
| Â | 2006/East | 881 | 694 | -1.55 | 0.12 |
| Â | 2006/West | 450 | 627 | -2.4 | 0.017 |
Max. Temp. | 2002/East | 780 | 694 | -1.04 | 0.3 |
| Â | 2002/West | 579 | 625 | -0.67 | 0.5 |
| Â | 2003/East | 730 | 695 | -0.49 | 0.63 |
| Â | 2003/West | 607 | 636 | -0.48 | 0.64 |
| Â | 2004/East | 536 | 696 | -1.32 | 0.19 |
| Â | 2004/West | 412 | 626 | -2.05 | 0.041 |
| Â | 2005/East | 532 | 696 | -1.0 | 0.32 |
| Â | 2005/West | 557 | 625 | -1.01 | 0.31 |
| Â | 2006/East | 877 | 694 | -1.51 | 0.13 |
| Â | 2006/West | 559 | 625 | -0.88 | 0.38 |
Min. Temp. | 2002/East | 741 | 694 | -0.57 | 0.57 |
| Â | 2002/West | 532 | 626 | -1.38 | 0.17 |
| Â | 2003/East | 712 | 695 | -0.234 | 0.81 |
| Â | 2003/West | 483 | 636 | -4.04 | <0.001 |
| Â | 2004/East | 598 | 695 | -0.80 | 0.42 |
| Â | 2004/West | 397 | 626 | -2.19 | 0.029 |
| Â | 2005/East | 556 | 696 | -0.85 | 0.40 |
| Â | 2005/West | 486 | 627 | -2.08 | 0.037 |
| Â | 2006/East | 820 | 694 | -1.04 | 0.30 |
| Â | 2006/West | 397 | 628 | -3.12 | 0.002 |