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Table 2 Results of the category-specific and final nultivariable Poisson regression analyses to identify predictors of annual WNV incidence in southern Ontario Public Health Units (PHUs), 2002–2013

From: Factors associated with human West Nile virus infection in Ontario: a generalized linear mixed modelling approach

  Category-Specific Multivariable
Category Variable Relative Risk 95% CI Relative Risk 95% CI
Land Cover (%) Swamp 1.13 [0.72,1.77]
Coniferous 0.86 [0.71,1.04]
Bog and fen 2.17 [0.12,38.69]
Deciduous 1.09 [0.92,1.29]
Dense deciduous forest 0.94 [0.85,1.03]
Open fen 0.92 [0.13,6.48]
Settlement and developed land 1 [0.98,1.03]
Water 0.99 [0.90,1.09]
Population Structure % Ages 1–14 0.94 [0.64,1.38]
% Ages 15–24 0.98 [0.54,1.78]
% Ages 25–34 0.71 [0.42,1.20]
% Ages 35–44 1.5 [0.87,2.61]
% Ages 45–54 0.45 [0.20,1.02]
% Ages 55+ 0.97 [0.90,1.04]
% Male population 0.53 [0.19,1.47]
Monthly Mean Minimum Temperature (°C) January 1.20 [0.89,1.60] 1.05 [1.00,1.10]
February 1.82 [1.31,2.53] 1.58 [1.42,1.75]
March 0.82 [0.56,1.21] 0.78 [0.71,0.83]
April 0.50 [0.31,0.79] 0.53 [0.42,0.63]
May 1.03 [0.74,1.42]
June 1.11 [0.61,2.03]
July 0.98 [0.64,1.51] 1.20 [1.05,1.40]
August 1.46 [0.91,2.34] 1.41 [1.02,1.55]
September 0.96 [0.58,1.58]
October 1.71 [1.05,2.77]
November 0.64 [0.35,1.16]
December 0.70 [0.42,1.15]
Monthly Mean Maximum Temperature (°C) January 0.86 [0.59,1.27]
February 0.91 [0.67,1.25]
March 0.87 [0.64,1.19]
April 1.08 [0.82,1.43] 0.85 [0.75,0.94]
May 1.26 [0.94,1.68]
June 0.60 [0.37,0.98]
July 1.38 [0.87,2.20]
August 1.10 [0.67,1.80] 1.2 [1.02,1.54]
September 1.60 [1.06,2.44]
October 0.79 [0.53,1.17]
November 1.04 [0.66,1.65]
December 1.50 [0.89,2.51]
Monthly Mean Precipitation (mm) January 0.99 [0.98,1]
February 0.98 [0.97,1] 0.99 [0.98,0.99]
March 0.99 [0.98,1] 1 [0.97,1.01]
April 0.99 [0.99,1]
May 1.00 [1,1.02]
June 0.99 [0.98,1]
July 1.00 [0.99,1]
August 1.00 [1,1.01]
September 1.01 [1,1.02]
October 1.00 [1,1.01]
November 1.01 [1,1.02]
December 1.00 [0.99,1.01]
Annual Percent Positive Mosquito Pools   1.29 [1.27,1.34] 1.07 [1.04,1.11]