Multivariate likelihood ratios (LRs) calculated from clinical examination and history for diagnosis of obstructive airway disease (OAD)*
| All patients | Patients without known OAD | |||
|---|---|---|---|---|
| Diagnostic elements | +LR | −LR | +LR | −LR |
| *LRs defined in glossary. | ||||
| Self reported history of OAD | 7.3 | 0.5 | Not applicable | Not applicable |
| Smoking >40 pack-years | 8.3 | 0.8 | 11.6 | 0.9 |
| Age ≥45 year | 1.3 | 0.4 | 1.4 | 0.5 |
| Maximum laryngeal height ≤4 cm | 2.8 | 0.8 | 3.6 | 0.7 |
| All factors present | 221 | 0.13 | 59 | 0.3 |