Table 2.
Logistic regression model for acute bovine respiratory disease (ABRD) occurrence in French bovine herds, November 2000–October 2001 (stratified random sample with n = 16,581 herds).
| Variable | Odds ratio |
p value | ||
|---|---|---|---|---|
| Estimate | 95% CI | |||
| Production type (reference = beef production) | Dairy | 1.85 | 1.78–1.91 | <0.0001 |
| Steer/young bull | 0.66 | 0.61–0.72 | <0.0001 | |
| Calf rearing | 0.32 | 0.27–0.38 | <0.0001 | |
| Others | 1.82 | 1.63–2.03 | <0.0001 | |
| Herd size (steps of 50 animals) | 1.34 | 1.33–1.35 | <0.0001 | |
| BRD vaccination | 4.45 | 4.30–4.60 | <0.0001 | |
Department as random effect: p < 0.0001. Intercept = −3.41.