Table 2.
Herd, climate and individual cow parameters pre-selected (P < 0·25) for inclusion in aEPEC modelling
| Parameter | Level | n | OR* | 95% CI | P value |
|---|---|---|---|---|---|
| Faecal score | (1,2) | 3 | 0·937 | 0·218–4·035 | 0·931 |
| (4,5) | 2 | 0·466 | 0·140–1·545 | 0·212 | |
| 3† | 30 | ||||
| Hygiene score | >2 | 7 | 0·609 | 0·263–1·412 | 0·248 |
| 1 or 2† | 28 | ||||
| Cow contact | Each unit increase | n.a. | 1·010 | 1·000–1·020 | 0·080 |
| Any disease or treatment | Any | 9 | 0·550 | 0·190–1·570 | 0·260 |
| None listed† | 26 | ||||
| Average weekly humidity (%) | Each unit increase | n.a. | 1·067 | 1·024–1·111 | 0·002 |
| Weekly precipitation (inches) | Each unit increase | n.a. | 0·740 | 0·520–1·070 | 0·113 |
aEPEC, Atypical enteropathogenic E. coli; OR, Odds ratio; CI, confidence interval; n.a., not applicable.
*
Comparison odds of shedding aEPEC.
†
Reference category.