Table 2.
Estimated odds ratios with 95% CI and coefficients with standard errors, along with p-values based on a logistic regression model on factors associated with herd level BRSV-status as measured by antibodies in bulk tank milk in 1194 dairy herds in two counties on the west-coast of Norway.
| Variable | OR | 95% CI | Coefficient | Std. Error | P-value |
|---|---|---|---|---|---|
| Herd size | 1.05 | (1.04–1.06) | 0.046 | 0.006 | <0.01 |
| x-coordinate (longitude) | 0.60 | (0.49–0.72) | −0.53 | 0.01 | <0.01 |
| y-coordinate (latitude) | 3.55 | (2.58–4.90) | 1.27 | 0.16 | <0.01 |
| Log of mean distance to 5 nearest herds, in km | 0.53 | (0.44–0.64) | −0.63 | 0.09 | <0.01 |
| Constant | – | −76.08 | 9.66 | <0.01 |