Table 3.
Sensitivity and specificity of California Mastitis Test (CMT) score cut‐points on admission for detecting quarters or cows with an intramammary infection based on bacterial culture. Data were obtained from 67 admissions of 57 lactating dairy cows with clinical mastitis (total of 255 quarters) and 72 admissions of 71 lactating dairy cows without clinical mastitis (total of 273 quarters)
| CMT Cut‐point | Cows with Clinical Mastitis | Cows Without Clinical Mastitis | ||
|---|---|---|---|---|
| Sensitivity | Specificity | Sensitivity | Specificity | |
| Quarter basis | ||||
| ≥trace | 0.84 | 0.38 | 0.45 | 0.56 |
| ≥1 | 0.72 | 0.54 | 0.27 | 0.80 |
| ≥2 | 0.54 | 0.67 | 0.13 | 0.91 |
| =3 | 0.36 | 0.82 | 0.05 | 0.98 |
| Cow basis (maximal quarter CMT value) | ||||
| ≥trace | 0.93 | 0.00 | 0.68 | 0.22 |
| ≥1 | 0.91 | 0.00 | 0.42 | 0.63 |
| ≥2 | 0.86 | 0.27 | 0.22 | 0.78 |
| =3 | 0.66 | 0.64 | 0.09 | 0.96 |