Table 8.
Final multivariable logistic regression model describing the association between risk factors and detection of Mycoplasma bovis by PCR on pooled broncho-alveolar lavage samples from epidemic respiratory disease in calves1
| Independent variable | Category | n | % positive | b | SE | OR | 95% CI | P-value |
|---|---|---|---|---|---|---|---|---|
| Intercept | −1.7 | 0.5 | <0.001 | |||||
| Recently purchased animals in the same airspace | No | 101 | 27.7 | Referent | ||||
| Yes | 15 | 66.7 | 1.6 | 0.6 | 5.0 | 1.5–16.5 | <0.01 | |
| Purchase of cattle | No | 26 | 15.4 | Referent | ||||
| Yes | 90 | 37.7 | 1.1 | 0.5 | 2.9 | 1.0–8.0 | 0.04 |
1
b = regression coefficient; OR = odds ratio.