First author [ref.] | Study | Subjects n | Age yrs | FEV1 | Smokers % |
Vestbo [1] | VESTBO | 290 | 59 | 2.4 (86) | 77 |
Watson [2] | EUROSCOP | 647 | 53 | 2.5 (80) | 54 |
Vestbo [3] | TRISTAN | 1465 | 63 | 1.4 (45) | 51 |
Calverley [4] | TORCH | 5343 | 65 | 1.2 (45) | 45 |
Burge [5] | ISOLDE | 751 | 64 | 1.4 (50) | 38 |
Wedzicha [6] | INSPIRE | 1323 | 65 | 1.3 (39) | 38 |
Data for forced expiratory volume in 1 s (FEV1) is presented as L (% predicted).