Table 4 Regression incidence rate ratio (IRR) and slope coefficients (β) values (respectively for the census subdivision and individual donation levels), 95% confidence intervals (95% CI), the P value for each variable, and the R2 for the model, for the multivariable modelling analyses on the WNV infection in the human donor population in Ontario from 2003 to 2022, at the analysis levels of the individual donor and the census subdivision.
Analysis level | Variable (units) | IRR/β [95% CI] | P | R2 |
|---|---|---|---|---|
Census subdivision | Low income (%) | 2.829 [2.061, 3.885] | < 0.001 | 0.677 |
High spending on shelter (%) | 0.702 [0.526, 0.939] | 0.017 | ||
Cx. pipiens/restuans (HSI) | 1.950 [1.160, 3.280] | 0.012 | ||
West Nile virus (HSI) | 1.179 [0.845, 1.645] | 0.333 | ||
Precipitations (mm) | 0.872 [0.558, 1.363] | 0.548 | ||
Population density (residents/km2) | 0.908 [0.720, 1.145] | 0.414 | ||
Mean income ($) | 1.316 [0.941, 1.839] | 0.108 | ||
Residents older than 64 (%) | 0.878[0.584, 1.321] | 0.533 | ||
Occupation in trades (%) | 0.807[0.479, 1.357] | 0.418 | ||
Occupation in natural resources (%) | 1.389 [0.927, 2.081] | 0.111 | ||
Land cover of wetlands (%) | 0.654 [0.347, 1.234] | 0.190 | ||
Land cover of wild grasslands (%) | 1.397 [0.909, 2.148] | 0.127 | ||
Land cover of forests (%) | 1.332 [0.680, 2.612] | 0.403 | ||
Individual donation | Donor age (years since birth) | 0.002 [0.001, 0.003] | < 0.001 | < 0.001 |
Year of detection test (date) | 0.002 [0.001, 0.002] | < 0.001 | ||
Month of detection test (date) | 0.003 [0.002, 0.003] | < 0.001 |
