Mean (SD) characteristics for total population (n = 6555) and for subjects with and without technically acceptable and reproducible measurements of FEV1
| Characteristics | Total population (n = 6555) | Reproducible FEV1 (n = 5740) | Non-reproducible FEV1 1-151 (n=815) |
|---|---|---|---|
| Age (years) | 42.1 (11.0) | 41.7 (10.9) | 44.7 (10.9) |
| Height (m) | 1.72 (0.094) | 1.72 (0.093) | 1.69 (0.097) |
| Sex (% women) | 52.3 | 51.9 | 55.6 |
| Smoking status (%) | |||
| Current smokers | 32.4 | 32.7 | 30.6 |
| Former smokers | 31.2 | 31.6 | 28.5 |
| Never smokers | 36.3 | 35.7 | 41.0 |
| Pack-years1-150 | 17.4 (15.4) | 17.2 (15.1) | 18.8 (16.9) |
| Educational level (%) | |||
| Low | 48.2 | 46.2 | 62.7 |
| Intermediate | 29.3 | 30.3 | 21.6 |
| High | 22.5 | 23.5 | 15.7 |
| BMI (kg/m2) | 25.4 (3.9) | 25. 3 (3.9) | 26.2 (4.3) |
| Physical activity (%) | 64.5 | 65.8 | 55.4 |
| Alcohol use (% yes) | 60.9 | 62.2 | 51.4 |
| Respiratory symptoms1-160(%) | 32.7 | 32.1 | 36.5 |
↵1-150 Excluding those subjects who never smoked.
↵1-160 One or more of the following respiratory symptoms: cough, phlegm, productive cough, wheeze, shortness of breath, nocturnal attacks of shortness of breath, ever asthma.
↵1-151 Including those subjects who were not able to perform at least three lung function manoeuvres (n = 452).