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Predictive value of clinical features for PBB.
| Variables | Sensitivity | Specificity |
|---|---|---|
| Cough duration ≤8.5 months | 75.9% | 75.6% |
| Productive cough | 81.8% | 67.8% |
| Yellow phlegm | 50.9% | 94.4% |
| SMIT | 67.3% | 60.5% |
| Sputum Lym ≥2.3% | 51.2% | 74.9% |
PBB: protracted bacterial bronchitis; SMIT: a sensation of mucus in the throat; Lym: lymphocyte.
