Table 2.
Risk factors for STEC fecal shedding in multivariable logistic regression analyses with mixed models
| Variable | No. of positive farm/sample | Total | Prevalence | Odds ratio (95% confidence interval) | P value |
|---|---|---|---|---|---|
| Farm level | |||||
| Housing: tie stall | 26 | 36 | 0·72 | 3·5 (1·7–7·1) | 0·001 |
| Feed box: flat | 17 | 35 | 0·49 | 0·3 (0·1–0·6) | 0·001 |
| Ventilation: mechanical | 39 | 72 | 0·54 | 0·4 (0·2–0·8) | 0·005 |
| Housing: free barn | 23 | 35 | 0·66 | 2·1 (1·1–4·1) | 0·032 |
| Bedding: manure | 2 | 7 | 0·29 | 0·2 (0·0–1·0) | 0·045 |
| Presence of pigs on the same farm | 2 | 3 | 0·67 | 4·5 (0·8–25·6) | 0·093 |
| Sample level | |||||
| Female | 117 | 415 | 0·28 | 2·5 (1·1–5·5) | 0·021 |
| Adult | 119 | 501 | 0·24 | 0·3 (0·1–0·9) | 0·034 |