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
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] | |