From: Level and course of FEV1 in relation to polymorphisms in NFE2L2 and KEAP1 in the general population
 | Doetinchem cohort (n = 1,152) | Vlagtwedde-Vlaardingen cohort (n = 1,390) |
---|---|---|
Total duration of follow-up (years) | 10 | 25 |
Number of visits (median) | 3 | 7 |
The total number of FEV 1 measurements across all visits | 3,115 | 8,159 |
Follow-up time frame, years | 1997–2007 | 1965–1990 |
Males, n (%) | 541 (47.0) | 714 (51.4) |
FEV 1 change in ml/year, mean (SD) | -26.2 (33.4) | -20.8 (22.9) |
Last available: | Â | Â |
FEV 1 level in liters, mean (SD) | 3.31 (0.80) | 2.86 (0.77) |
Age in years, median (range) | 53.7 (32–76) | 52.0 (35–79) |
Never smokers, n (%) | 372 (32.3) | 445 (32.0) |
Packyears smoked in ever smokers, median (range) | 13.2 (0.004–84.0) | 18.9 (0.1–262.2) |