Table 3.
Coefficients, incidence risk ratios and 95% and their confidence intervals for the final two models using the count of positive confirmed cases in the initial cull as dependent variable and the flock-susceptibility risk indicators as the main explanatory variables.
| Variables | Model 4 (Low susceptibility) | Model 5 (High susceptibility) | ||||
|---|---|---|---|---|---|---|
| Coef. | IRR | 95%CI | Coef. | IRR | 95%CI | |
| constant | -4.05 | -6.2- -1.91 | -4.23 | -6.16- -2.3 | ||
| Flock-susceptibility risk indicator | 0.42 | 1.52 | 1.15-2 | 0.46 | 1.59 | 1.21-2 |
| Country | ||||||
| Wales | 1.93 | 6.9 | 0.8-60 | 2.2 | 9 | 1.12-72.2 |
| Scotland | 2.24 | 9.4 | 1.15-76.2 | 2.23 | 9.4 | 1.31-66.9 |
| # animals (baseline: < 300) | ||||||
| 300-1 000 | 2.37 | 10.7 | 1.34-86.2 | 2.34 | 10.4 | 1.52-71 |
| > 1 000 | 2.95 | 19.1 | 2.53-145 | 3 | 20.2 | 3.13-130.4 |
| Scotland × 300-1 000 | -3.6 | 0.02 | 0-0.78 | -3.6 | 0.02 | 0-0.57 |
| Scotland × > 1 000 | -4.3 | 0.01 | 0-0.2 | -4.38 | 0.01 | 0-0.17 |
Parameters in bold are significant at 0.05 level