Table 1 Characteristics participants included in sample 1 and sample 2
From: GST-omega genes interact with environmental tobacco smoke on adult level of lung function
| Â | Sample 1 | Sample 2 (verification) |
|---|---|---|
n | 8128 | 5308 |
Males, n (%) | 3483 (43) | 2133 (40) |
Age, median (min-max) | 47 (18–89) | 48 (21–90) |
Smoking status, n (%) | Â | Â |
  Never, n (%) | 3277 (40) | 2154 (41) |
  Ex, n (%) [median (min-max)] | 2882 (36) [8 (0–86)] | 2014 (39) [7 (0–100)] |
  Current, n (%) [median (min-max)] | 1936 (24) [15 (0–100)] | 1065 (20) [16 (0–81)] |
ETS exposure, n (%) | Â | Â |
  In utero | 867 (13) | 559 (13) |
  ≥ 1 hour/day | 1788 (24) | 1029 (21) |
  At the workplace | 565 (7) | 303 (6) |
Lung function, mean (sd) | Â | Â |
  FEV1 (ml) | 3412 (831) | 3331 (840) |
  FEV1pp (%)1 | 102 (14) | 102 (14) |
  FEV1/FVC (%) | 77 (7) | 76 (7) |
Spirometry available, n | 7635 | 5070 |