Table 2. Associations of hematocrit, non-esterified fatty acid, antithrombin activity, platelet count and dysstasia with the fatal outcome of naturally occurring acute Escherichia coli mastitis in 34 clinical cases.
| Parameters | Cutpoint | Odds ratio a) | 95% CI a) | P a) | Sensitivity (%) |
Specificity (%) |
Predictive value (%) |
Likelihood ratio |
|---|---|---|---|---|---|---|---|---|
| Observed at onset (Day 1, n=34) | ||||||||
| Dysstasia | positive | 1.8 | 0.3 to 12.5 | 0.44 | 25.0 | 84.6 | 33.3 | 1.6 |
| Observed in one day after onset (Day 2, n=34) | ||||||||
| Hematocrit (%) | >32 | 4.5 | 0.8 to 24.1 | 0.08 | 62.5 | 73.1 | 41.7 | 2.3 |
| Non-esterified fatty acid (mEq/l) | >0.4 | 3.2 | 0.6 to 16.3 | 0.16 | 62.5 | 65.4 | 35.7 | 1.8 |
| Antithrombin activity (%) | <120 | 2.3 | 0.4 to 11.6 | 0.28 | 62.5 | 57.7 | 31.3 | 1.5 |
| Platelet count (×104/ml) | <15 | 12.6 | 1.9 to 82.1 | <0.01 | 75.0 | 80.8 | 54.5 | 3.9 |
| Dysstasia | positive | 12.8 | 2.0 to 82.9 | <0.01 | 62.5 | 88.5 | 62.5 | 5.4 |
| At least 3 parameters fell within the ranges | 7.0 | 1.2 to 39.6 | <0.05 | 62.5 | 80.8 | 50.5 | 3.3 | |
| Observed in two day after onset (Day 3, n=24) | ||||||||
| Dysstasia | positive | 21.0 | 2.4 to 185.9 | <0.01 | 75.0 | 87.5 | 33.3 | 6.0 |
a) From Fisher’s exact probability test. 95% CI=95% confidence interval around the odds ratio.