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Proportion of positive herds to S. aureus and their relation to somatic cell count on bulk tank milk
| SCC (cells/ml)a | Positive herds to S. aureus | Odds ratio | CI (95 %)b | P value |
|---|---|---|---|---|
| ≤150,000 | 16.7 % (2/12) | Reference | – | – |
| >150,000–≤250,000 | 55.3 % (26/47) | 6.2 | 1.2–31.4 | 0.03 |
| >250,000–≤400,000 | 72.2 % (26/36) | 13.0 | 2.4–70.1 | 0.003 |
| >400,000 | 100 % (5/5) | 46.2 | 1.9–114.1 | 0.02 |
aSCC somatic cell count measured from bulk tank milk according official report—June 2014
b CI (95 %) 95 % confidence interval
