Odds ratio (OR) and 95% confidence intervals (CI) of asthma and chronic bronchitis/emphysema (CBE) due to different nasal symptoms in 20–59 yr old subjects calculated using multiple logistic regression analysis
| Asthma | CBE | |||
| Risk factor | OR | 95% CI | OR | 95% CI |
| Watery nasal catarrh | 1.61 | 1.26–2.06 | 1.50 | 1.14–1.97 |
| Thick yellow nasal catarrh | 1.11 | 0.80–1.53 | 2.38 | 1.74–3.25 |
| Blocked nose | 1.85 | 1.4–2.32 | 1.53 | 1.18–1.99 |
| Sneezing | 1.66 | 1.27–2.17 | 1.09 | 0.80–1.47 |
| Itching | 1.71 | 1.30–2.26 | 1.19 | 0.84–1.69 |