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| Risk factors | Beta | SE | Wals | P | OR | 95% CI |
| Age | 0.536 | 0.156 | 11.764 | 0.001 | 1.709 | 1.258-2.322 |
| Season | 0.534 | 0.214 | 6.242 | 0.012 | 1.706 | 1.122-2.594 |
| Occupation | -0.183 | 0.285 | 0.414 | 0.520 | 0.832 | 0.476-1.455 |
SE: Standard error; Wals: Wald statistic; OR: Odds ratio; CI: Confidence interval.
