Factor | Adjusted OR (95% CI) | p-value |
FEV1 <80% pred | 4.9 (1.7–14.3) | 0.004 |
Pseudomonas aeruginosa | 5.5 (1.5–20.8) | 0.01 |
Haemophilus influenzae | 5.8 (1.6–21.2) | 0.007 |
Other potentially pathogenic micro-organisms | 10.9 (2.3–50.3) | 0.002 |
Varicose or cystic bronchiectasis | 8.7 (2.8–26.7) | <0.0001 |
Diagnosed aged <45 yrs | 3.1 (1.04–9.5) | 0.04 |