Table 1 Validity of single quarter samples in diagnosing intramammary Staph. aureus infections (95% confidence interval between brackets)
From: Mastitis diagnostics and performance monitoring: a practical approach
| Â | All cows | Cows with SCC > 200,000 cells/ml | Cows with SCC repeatedly >200,000 cells/ml |
|---|---|---|---|
Sensitivity | 0.92 (0.90; 0.95) | 0.91 (0.88; 0.95) | 0.90 (0.86; 0.95) |
Specificity | 0.98 (0.98; 0.98) | 0.87 (0.86; 0.89) | 0.97 (0.97; 0.98) |
Pred. Value Pos. | 0.54 (0.51; 0.58) | 0.41 (0.38; 0.46) | 0.82 (0.78; 0.88) |
Pred. Value Neg. | 0.99 (0.99; 1.00) | 0.99 (0.99; 0.99) | 0.98 (0.98; 0.99) |