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Table 1 Descriptive characteristics of 29 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 Variable Mean Standard Deviation
Cumulative Human WNVa Incidence (cases per 100,000 population)   7.13 7.17
Land Cover (%; N = 29) Swamp 2.12 2.15
Coniferous 7.56 8.82
Bog and fen 0.17 0.37
Deciduous 6.18 6.87
Dense deciduous forest 11.55 4.75
Open fen 0.17 0.28
Settlement and developed land 6.68 15.39
Water 3.30 4.25
Population Structure (N = 29) % Ages 1–14 16.64 1.67
% Ages 15–24 13.0 0.83
% Ages 25–34 11.17 1.43
% Ages 35–44 12.49 1.43
% Ages 45–54 16.19 0.60
% Ages 55+ 30.52 4.34
% Male Population 49.00 0.44
Monthly Mean Minimum Temperature (oCb; N = 348) January −9.90 4.23
February −9.82 3.08
March −4.76 2.84
April 1.47 1.46
May 7.27 1.79
June 13.00 1.55
July 15.54 1.59
August 14.51 1.47
September 10.73 1.53
October 4.85 1.87
November −0.05 1.94
December −5.94 2.86
Monthly Mean Maximum Temperature (oC; N = 348) January −1.99 3.24
February −1.02 2.19
March 4.99 2.93
April 12.38 1.87
May 19.02 1.97
June 24.19 1.56
July 27.02 1.84
August 25.85 1.24
September 22.00 1.68
October 14.03 1.81
November 7.95 1.93
December 0.93 2.40
Monthly Mean Precipitation (mm;c N = 348) January 68.33 24.33
February 57.43 24.64
March 60.10 24.50
April 75.87 29.46
May 82.95 31.27
June 79.70 31.90
July 86.43 28.90
August 70.00 25.57
September 84.52 31.31
October 86.10 34.16
November 80.15 29.62
December 78.80 26.75
  1. aWNV = West Nile Virus
  2. b°C = degrees Celsius
  3. cmm = millimetres