| Vlagtwedde/Vlaardingen N = 1390 | Doetinchem N = 1152 |
---|---|---|
Age at last survey, yrs | 52 (35-79) | 50 (31-71) |
Males, % | 51 | 47 |
Pack-years | 9.0 (0-262.1) | 5 (0-84) |
Never smokers, n (%) | 445 (32.0) | 371 (32.2) |
last FEV1%pred* | 93.5 (36.0-138.1) | 106.6 (39.1-150.7) |
ΔFEV1, ml/yr†| -21.1 (-121;155) | -28.7 (-292; 130) |
FEV1 values, n | 7 (1-8) | 2 (2-2) |
Yrs of follow-up | 21 (0-25) | 5 (5-5) |
GOLD stage > II,n (%) | 186 (13.4) | 37 (3.2) |