Table 2.
Summary statistics and odds ratio (OR) and 95% confidence interval (95% CI) for the presence of clinical signs at farm level with virus cluster and time of diagnosis in kits or adult females for all 69 infected farms.
Variable | Categories | N 1 | Mean 2 | OR 3 | 95% CI 3 |
---|---|---|---|---|---|
Cluster | A | 41 | 5.27 | Ref 3 | |
C vs. A | 15 | 4.00 | 0.81 | 0.45–1.45 | |
D vs. A | 7 | 1.57 | 0.22 | 0.08–0.53 * | |
Cluster | C | 15 | 4.00 | Ref | |
A vs. C | 41 | 5.27 | 1.23 | 0.69–2.21 | |
D vs. C | 7 | 1.57 | 0.27 | 0.09–0.72 * | |
Diagnosis kits 4 | <August | 27 | 1.44 | Ref | |
≥August | 42 | 3.57 | 4.25 | 1.90–10.39 * | |
Diagnosis females 5 | <August | 27 | 2.67 | Ref | |
≥August | 42 | 3.95 | 1.80 | 0.99–3.35 |
1 Total number of farms for the given variables; 2 Mean number of clinical symptoms observed on the farm at time of official sampling; 3 Clustered univariable grouped binomial logistic regression model estimates for the unadjusted odds ratio (OR) and lower and upper values for the 95% confidence interval (CI) around the OR for the likelihood of observing a symptom. 3 Ref is the category used as reference. 4 Total number of clinical signs in kits at time of diagnosis. This also corresponds to an age of kits <12 weeks before 1 August 2020 and >12 weeks from 1 August 2020 onwards; 5 Total number of clinical signs in adult females at time of diagnosis; * Significant associations are indicated with an asterisk.