Prevalence (%) of respiratory symptoms with relation to cumulative fibre exposure (in fibreyears)
| Controls | ≤3 | >3 | p value* | |
|---|---|---|---|---|
| *Exact Cochran Armitage test. | ||||
| Symptoms | ||||
| Mucosal irritation | 0 | 20.2 | 24.8 | <0.001 |
| Dry nose | 7 | 32.1 | 25.4 | 0.048 |
| Blocked nose | 2.8 | 25.3 | 23.6 | <0.004 |
| Sneezing attacks | 1.4 | 1.1 | 6.7 | 0.013 |
| Nose bleeding | 4.2 | 11.5 | 9.6 | 0.427 |
| Hoarseness | 0 | 2.3 | 4.2 | 0.059 |
| Cough | 0 | 15.7 | 17.6 | 0.001 |
| Phlegm | 0 | 3.4 | 4.2 | 0.123 |
| Dyspnoea | 0 | 1.1 | 7.9 | <0.001 |
| Exercise induced dyspnoea | 9.7 | 11.5 | 19.2 | 0.028 |
| Diseases | ||||
| Sinusitis | 6.9 | 6.9 | 6.6 | 0.999 |
| Laryngitis | 5.6 | 1.0 | 2.3 | 0.371 |
| Chronic bronchitis | 12.5 | 14.7 | 24.3 | 0.012 |
| Asthma | 2.8 | 5.3 | 5.4 | 0.533 |
| Pneumonia | 13.9 | 16.4 | 10.8 | 0.328 |
| Tuberculosis | 1.4 | 2.1 | 2.4 | 0.652 |
| Acute bronchitis | 9.7 | 9.0 | 10.2 | 0.909 |