Table 2 Self‐reported and interview‐based occupational quartz exposure in those with and without respiratory symptoms in a Norwegian general population study, 1987–8.
| Symptom | Quartz exposure | |||
|---|---|---|---|---|
| Self‐reported | Interview based | Sensitivity | Specificity | |
| Morning cough | ||||
| Yes (n = 180) | 9.4% | 12.2% | 59.1% | 98.6% |
| No (n = 534) | 2.1% | 7.5% | 21.0% | 99.4% |
| Chronic cough | ||||
| Yes (n = 92) | 10.9% | 12.0% | 63.6% | 97.4% |
| No (n = 622) | 2.9% | 8.2% | 27.5% | 99.5% |
| Phlegm when coughing | ||||
| Yes (n = 179) | 8.4% | 12.3% | 45.5% | 96.4% |
| No (n = 535) | 2.4% | 7.0% | 27.5% | 98.3% |
| Breathlessness grade 2 | ||||
| Yes (n = 94) | 9.6% | 14.9% | 50.0% | 95.5% |
| No (n = 620) | 3.1% | 7.7% | 29.2% | 98.3% |
| Wheezing | ||||
| Yes (n = 196) | 8.2% | 13.3% | 50.0% | 96.0% |
| No (n = 518) | 2.3% | 6.9% | 22.2% | 99.6% |
| Asthma | ||||
| Yes (n = 88) | 8.1% | 18.0% | 62.9% | 98.0% |
| No (n = 626) | 2.2% | 7.2% | 21.0% | 100.0% |
Source: Bakke et al.15