Table 1

Subject characteristics

Never
smokers
Current
smokers
Number of subjects, N (%)903 (57.8)658 (42.2)
Male, N (%)508 (56.3)375 (57.0)
Age (years), median (min–max)46 (18–80)46 (22–79)
Pack years (years), mean (min– max)20.6 (5.1–95.0)
COPD (FEV1/FVC <70%), N (%)316 (35.0)279 (42.4)
Lung function, mean (SD)
 FEV1 (L)3.5 (0.9)3.4 (0.9)
 FEV1%predicted (%)*100.5 (14.5)94.4 (14.9)
 FEV1/FVC (%)84.5 (8.2)71.7 (8.8)
Moderate COPD, N (%) †56 (6.2)100 (15.2)
  • *Calculated with GLI-2012 if possible.

  • †COPD GOLD stage >2 (FEV1/FVC <70% and FEV1 between 50% and 80% of predicted).

  • COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.