Demographic data at baseline for the cohort according to obstruction status
| Total cohort | FEV1/FVC >70% | FEV1/FVC <70% | |
| Number of participants | 2085 | 1391 | 694 |
| Age (years) | 59.8 (5.3) | 59.4 (5.2) | 60.5 (5.5) |
| Height (m) | 1.78 (0.06) | 1.79 (0.06) | 1.78 (0.06) |
| Weight (kg) | 85.4 (12.3) | 87.0 (12.0) | 82.5 (12.3) |
| BMI (kg/m2) | 26.9 (3.4) | 27.2 (3.2) | 26.2 (3.5) |
| Years in study* | 3.0 (2.9–3.1) | 3.0 (2.9–3.1) | 3.0 (2.9–3.1) |
| Pack-years smoking | 40.3 (17.8) | 39.4 (18.2) | 42.0 (16.7) |
| Current smokers (%) | 54.9 | 53.2 | 58.4 |
| GOLD classification | |||
| Normal (%) | 66.4 | 100 | 0 |
| Stage I (%) | 21.5 | 0 | 64.5 |
| Stage II (%) | 10.5 | 0 | 30.8 |
| Stage III (%) | 1.6 | 0 | 4.7 |
| Emphysema severity (Perc15) | −934.9 (19.5) | −931.0 (19.2) | −942.5 (17.7) |
Values are mean (SD) unless otherwise indicated.
* Median (IQR).
BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.