Table 3.
The percentage of minks with clinical signs on the seven extensively sampled farms, with for each of the variables with a significant association with clinical signs, i.e., coat color, sex/age, and a positive ELISA test result, the odds ratio (OR) and 95% confidence interval (95% CI) based on the univariable logistic regression models.
| Independent Variable | Categories | N 1 | Clinical Signs (%) 2 | OR 3 | 95%CI 3 |
|---|---|---|---|---|---|
| Coat color 4 | Dark: wild, brown, MAH | 750 | 11.9 | Ref 3 | |
| Light: SBL and SCR | 466 | 4.07 | 0.35 | 0.29–0.60 * | |
| Other: Jag, pearl, black, other | 187 | 2.19 | 0.41 | 0.10–1.42 | |
| Sex/age 5 | Juvenile males | 388 | 11.08 | Ref 3 | |
| Juvenile females | 521 | 4.99 | 0.33 | 0.19–0.60 * | |
| Adult females | 494 | 8.70 | 1.10 | 0.50–1.29 | |
| Sex/age 5 | Juvenile females | 521 | 4.99 | Ref 3 | |
| Juvenile males | 388 | 11.08 | 3.02 | 1.78–5.25 * | |
| Adult females | 494 | 8.70 | 2.64 | 1.44–4.19 * | |
| ELISA | Negative | 1348 | 7.03 | Ref 3 | |
| Positive | 55 | 23.64 | 2.64 | 1.24–5.38 * |
1 Total number of mink for the given variables; 2 Percentage of mink with clinical signs; 3 Final univariable mixed effect logistic regression model estimates for the adjusted odds ratio (OR) and lower and upper values for the 95% confidence interval (CI) around the OR for the likelihood of presence of clinical signs for the given variables. 3 Ref is the category used as reference. 4 Dark coat color = wild, brown or mahogany (MAH), light = silver blue (SBL) and silver cross (SCR), other coat colors = jaguar (Jag), pearl, black, others). 5 Juveniles are <1 year, adults >1 year of age; * Significant associations based on the 95% CI are indicated with an asterisk.