Table 1. Univariate analysis of host factors for clinical severity of mastitis at onset.
| Variables | Category | Severity | P value | |||
|---|---|---|---|---|---|---|
| Mild (n=25) | Moderate (n=44) | Severe (n=19) | ||||
| Numerical | ||||||
| Age (year) | 4.6 ± 1.5 | 4.4 ± 1.5 | 4.2 ± 1.8 | 0.504 | ||
| Days in milk | 177.5 ± 97.7 | 175.55 ± 141.9 | 101.9 ± 79.4 | 0.091a) | ||
| Categorical | ||||||
| Proviral load | 1,000≤ | 6 | 7 | 10 | ||
| <1,000 | 15 | 29 | 9 | 0.027a) | ||
| 0 | 4 | 8 | 0 | |||
| Farm | 1 | 6 | 9 | 11 | 0.011a) | |
| 2 | 19 | 35 | 8 | |||
| Concurrent disease | Yes | 0 | 0 | 1 | ||
| No | 25 | 44 | 18 | 0.216 | ||
| Season | Spring | 5 | 12 | 9 | ||
| Summer | 2 | 10 | 4 | |||
| Autumn | 3 | 10 | 5 | 0.08a) | ||
| Winter | 15 | 12 | 1 | |||
Numerical variables were presented as means ± SDs and examined by the Kruskal-Wallis test. Categorical variables were presented as numbers and examined by the Fisher’s exact test (a: P<0.2). SD=standard deviation.