Table 2.
Sensitivity, specificity, and AUC (±SEM) of SAA to predict development of R. equi pneumonia at the same time as or before development of clinical signs at an endemic farm
| Cut‐point (μg/mL) | Sensitivity % (95% CI) | Specificity % (95% CI) | AUC | P valuea |
|---|---|---|---|---|
| ≥5 | 72 (51–88) | 45 (24–68) | 0.587 ± 0.071 | 0.300 |
| ≥15 | 72 (51–88) | 50 (28–72) | 0.610 ± 0.071 | 0.188 |
| ≥50 | 64 (43–82) | 68 (45–86) | 0.661 ± 0.071 | 0.026 |
| ≥200 | 44 (24–65) | 73 (50–89) | 0.584 ± 0.070 | 0.318 |
| ≥1,000 | 16 (5–36) | 95 (77–100) | 0.557 ± 0.044 | 0.497 |
a
A P value < 0.05 rejects the null hypothesis that measurement of SAA at a given cut‐off has an AUC of 0.5.