Table 1. Bivariate analyses of risk factors for quarter milk loss after acute coliform mastitis.
| Variables | Category | Outcome | P value | |
|---|---|---|---|---|
| Complete loss of quarter | Marketable milk | |||
| (n=21) | (n=32) | |||
| Continuous variablesa) | ||||
| Age (days) | 1,746 ± 536 | 1,856 ± 612 | 0.611 | |
| Days in milk (days) | 143 ± 135 | 106 ± 100 | 0.398 | |
| Body temperature (°C) | 40.2 ± 0.7 | 40.1 ± 1.2 | 0.978 | |
| Categorical variables | ||||
| Bacteria | Klebsiella spp. | 6 | 12 | 0.565 |
| E. coli | 15 | 20 | ||
| Systemic antibiotic | None | 6 | 6 | |
| FQ | 2 | 14 | 0.013 | |
| Others | 13 | 12 | 0.099 | |
| Local antibiotic | None | 5 | 13 | |
| FQ | 6 | 13 | 0.400 | |
| Others | 9 | 6 | 0.070 | |
| Systemic NSAID | No | 5 | 10 | 0.756 |
| Yes | 16 | 22 | ||
| Systemic steroid | No | 16 | 23 | 1.000 |
| Yes | 5 | 9 | ||
| Local steroid | No | 6 | 10 | 1.000 |
| Yes | 15 | 21 | ||
| Mammary irrigation regimen | No | 6 | 4 | 0.169 |
| Yes | 15 | 28 | ||
a) The data represent the mean ± standard deviation. FQ, fluoroquinolone; NSAID, nonsteroidal anti-inflammatory drug.