Table 4.
Sensitivity and specificity of different cut‐points for the clinical prediction rule to identify persistently frequent exacerbators
| Cut‐point | Derivation cohort | Validation cohort | ||
|---|---|---|---|---|
| Sensitivity, % | Specificity, % | Sensitivity, % | Specificity, % | |
| ≥ 0 | 100.0 | 0.0 | 100.0 | 0.0 |
| ≥ 1 | 100.0 | 35.2 | 100.0 | 27.5 |
| ≥ 2 | 83.3 | 63.5 | 100.0 | 51.3 |
| ≥ 3 | 72.2 | 81.1 | 100.0 | 71.3 |
| ≥ 4 | 44.4 | 95.0 | 100.0 | 91.3 |
| ≥ 5 | NAa | NAa | 25.0 | 95.0 |
| ≥ 6 | 11.1 | 100.0 | 0.0 | 100.0 |
| 7 | 5.6 | 100.0 | 0.0 | 100.0 |
a
NA, not applicable: sensitivity and specificity not available because no individual in the derivation cohort had a score of 5.