Table 2.
Effects of animal factors on the shedding of E. coli O157 in a cohort of 52 dairy heifers, identified by logistic regression.
| Parameter | n | Estimate | s.e. | 95% CI | P | OR |
|---|---|---|---|---|---|---|
| Body score 2 | 176 | −0·659 | 0·159 | −0·970 to −0·348 | n.a. | 1 |
| Body score 3 | 515 | 0·476 | 0·182 | 0·120 to 0·832 | 0·009 | 1·61 |
| Body score 4 | 151 | 0·993 | 0·229 | 0·545 to 1·44 | <0·001 | 2·7 |
| Faecal score 1 | 48 | −0·788 | 0·311 | −1·397 to −0·180 | n.a. | 1 |
| Faecal score 2 | 184 | 0·548 | 0·344 | −0·126 to 1·223 | 0·111 | 1·730 |
| Faecal score 3 | 585 | 0·621 | 0·321 | 0·009 to 1·250 | 0·054 | 1·860 |
| Faecal score 4 | 25 | 1·733 | 0·542 | 0·670 to 2·795 | 0·001 | 5·657 |
s.e. Standard error; CI, confidence interval; OR, odds ratio; n.a., not applicable as the reference level.