Table 2.
Multivariable logistic regression model of the days with/without cases and the temperature at the day of clinical signs and temperature lagged 1, 2, or 3 days before onset of clinical symptoms, during each meteorological season compared to Winter over the 6 year study period.
| Independent variable | Odds ratio | Lower 95% CI | Upper 95% CI | P-value |
|---|---|---|---|---|
| Temperature | 0.89 | 0.80 | 0.99 | 0.0347* |
| TempLag1 | 1.11 | 0.95 | 1.30 | 0.1760 |
| TempLag2 | 0.94 | 0.80 | 1.10 | 0.4366 |
| TempLag3 | 1.11 | 0.99 | 1.23 | 0.0729 |
| Autumn | 0.76 | 0.37 | 1.56 | 0.4537 |
| Spring | 0.65 | 0.31 | 1.35 | 0.2483 |
| Summer | 0.42 | 0.14 | 1.20 | 0.1042 |
| 2007 | 0.63 | 0.31 | 1.24 | 0.1813 |
| 2008 | 0.35 | 0.16 | 0.81 | 0.0137* |
| 2009 | 0.67 | 0.34 | 1.32 | 0.2515 |
| 2010 | 0.98 | 0.53 | 1.82 | 0.9409 |
| 2011 | 0.94 | 0.51 | 1.75 | 0.8505 |
*
p < 0.05.