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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.

From: Landscape, demographic, entomological, and climatic associations with human disease incidence of West Nile virus in the state of Iowa, USA

Variable Year/Region With WNV Mean Rank Without WNV Mean Rank z-score P
Precipitation 2002/East 701 695 -0.16 0.88
  2002/West 776 619 -2.31 0.021
  2003/East 733 694 -0.53 0.6
  2003/West 465 637 -4.57 <0.001
  2004/East 678 695 -0.14 0.89
  2004/West 626 623 -0.23 0.98
  2005/East 679 695 -0.96 0.92
  2005/West 623 624 -0.01 0.99
  2006/East 421 697 -2.27 0.023
  2006/West 526 625 -1.35 0.18
Dewpoint 2002/East 708 695 -0.74 0.94
  2002/West 581 625 -0.65 0.52
  2003/East 747 694 -0.71 0.48
  2003/West 479 636 -4.15 <0.001
  2004/East 516 696 -1.49 0.14
  2004/West 512 625 -1.08 0.28
  2005/East 547 695 -0.91 0.37
  2005/West 616 624 -0.11 0.91
  2006/East 881 694 -1.55 0.12
  2006/West 450 627 -2.4 0.017
Max. Temp. 2002/East 780 694 -1.04 0.3
  2002/West 579 625 -0.67 0.5
  2003/East 730 695 -0.49 0.63
  2003/West 607 636 -0.48 0.64
  2004/East 536 696 -1.32 0.19
  2004/West 412 626 -2.05 0.041
  2005/East 532 696 -1.0 0.32
  2005/West 557 625 -1.01 0.31
  2006/East 877 694 -1.51 0.13
  2006/West 559 625 -0.88 0.38
Min. Temp. 2002/East 741 694 -0.57 0.57
  2002/West 532 626 -1.38 0.17
  2003/East 712 695 -0.234 0.81
  2003/West 483 636 -4.04 <0.001
  2004/East 598 695 -0.80 0.42
  2004/West 397 626 -2.19 0.029
  2005/East 556 696 -0.85 0.40
  2005/West 486 627 -2.08 0.037
  2006/East 820 694 -1.04 0.30
  2006/West 397 628 -3.12 0.002