Table 5.
Correlations of assigned climate risk factors to E. coli O157 shedding and super-shedding in a cohort of 52 dairy heifers. Associations >0·5 (moderate) are shown in bold. Time-frame represents the number of days prior to sampling over which climate factors were assessed
| Climate factor | Time-frame (days) | O157 shedding | Super-shedding |
|---|---|---|---|
| T ⩾30 | 3 | −0·031* | −0·418 |
| T ⩾37 | 3 | 0·164 | −0·178* |
| T ⩾40 | 3 | 0·251 | −0·117* |
| T ⩾30 | 5 | 0·182 | −0·278* |
| T ⩾37 | 5 | 0·164 | −0·178 |
| T ⩾40 | 5 | 0·251 | −0·117* |
| T ⩾30 | 7 | 0·083 | −0·298* |
| T ⩾37 | 7 | 0·075* | −0·274* |
| T ⩾40 | 7 | 0·033* | −0·408 |
| T ⩾30 | 14 | 0·363 | −0·200 |
| T ⩾37 | 14 | 0·314 | −0·262* |
| T ⩾40 | 14 | 0·269 | −0·246* |
| Rainfall ⩾0·1 mm | 3 | 0·388 | 0·573 |
| Rainfall >10 mm | 3 | 0·409 | 0·491 |
| Rainfall ⩾0·1 mm | 5 | 0·300 | 0·605 |
| Rainfall >10 mm | 5 | 0·507 | 0·598 |
| Rainfall ⩾0·1 mm | 7 | 0·460 | 0·693 |
| Rainfall >10 mm | 7 | 0·605 | 0·764 |
| Rainfall ⩾0·1 mm | 14 | 0·406 | 0·666 |
| Rainfall >10 mm | 14 | 0·480 | 0·637 |
| RH ⩾80 | 3 | 0·060 | 0·560 |
| RH ⩾90 | 3 | 0·350 | 0·050* |
| RH ⩾95 | 3 | 0·350 | 0·050* |
| RH ⩾80 | 5 | −0·030 | 0·680 |
| RH ⩾90 | 5 | 0·200 | 0·320* |
| RH ⩾95 | 5 | 0·240 | 0·530 |
| RH ⩾80 | 7 | 0·219 | 0·573 |
| RH ⩾90 | 7 | 0·532 | 0·515 |
| RH ⩾95 | 7 | 0·321 | 0·750 |
| RH ⩾80 | 14 | 0·142 | 0·520 |
| RH ⩾90 | 14 | 0·355 | 0·475 |
| RH ⩾95 | 14 | 0·290 | 0·471 |
| SE ⩾20 | 3 | −0·369 | −0·283 |
| SE ⩾25 | 3 | −0·344 | −0·392 |
| SE ⩾30 | 3 | −0·241 | −0·463 |
| SE ⩾20 | 5 | −0·289 | −0·395* |
| SE ⩾25 | 5 | −0·159 | −0·387 |
| SE ⩾30 | 5 | −0·047* | −0·484 |
| SE ⩾20 | 7 | −0·397 | −0·564 |
| SE ⩾25 | 7 | −0·265 | −0·404 |
| SE ⩾30 | 7 | −0·064 | −0·424 |
| SE ⩾20 | 14 | −0·421 | −0·557 |
| SE ⩾25 | 14 | −0·162 | −0·310* |
| SE ⩾30 | 14 | 0·014 | −0·388 |
RH, Relative humidity; SE, solar exposure.
*
Associations not significant by logistic regression