Skip to main content

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

  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 (%)   
  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 (%)   
  In utero 867 (13) 559 (13)
  ≥ 1 hour/day 1788 (24) 1029 (21)
  At the workplace 565 (7) 303 (6)
Lung function, mean (sd)   
  FEV1 (ml) 3412 (831) 3331 (840)
  FEV1pp (%)1 102 (14) 102 (14)
  FEV1/FVC (%) 77 (7) 76 (7)
Spirometry available, n 7635 5070
  1. The second sample (sample 2) was used to verify the initial findings from sample 1, both samples are part of the LifeLines population-based cohort study.
  2. 1 FEV1pp = FEV1 as percentage predicted based on reference equations constructed by Quanjer et al. [28].