Table 6 Final multivariable logistic regression model for flock risk factors for outbreaks of infectious arthritis in lambs
From: Flock-level risk factors for outbreaks of infectious arthritis in lambs, Norway 2018
Variable | Categories | n cases | n controls | OR | 95% CI |
|---|---|---|---|---|---|
Flock sizea | 1.3 | 1.1–1.4 | |||
Flooring in lambing pen | Metal mesh flooring | 23 | 525 | Base | |
Plastic mesh flooring | 38 | 235 | 3.0 | 1.7–5.3 | |
Other | 16 | 418 | 0.9 | 0.5–1.7 | |
Observed infections/pus around ear tag wounds | No (never/rarely) | 39 | 874 | Base | |
Yes (sometimes, often) | 38 | 304 | 2.6 | 1.6–4.3 | |
Lambing percentage | ≤ 200 | 17 | 468 | Base | |
> 200 | 60 | 710 | 2.0 | 1.1–3.5 |