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Table 1 Baseline characteristics of COPD subjects with chronic bronchitis and smokers with normal spirometry as a control group

From: Genetic susceptibility for chronic bronchitis in chronic obstructive pulmonary disease

  COPDGene NHWs GenKOLS ECLIPSE
COPD with CB Controls COPD with CB Controls COPD with CB Controls
n 844 2,534 311 808 507 178
Age, years 62.8 (8.3) 59.5 (8.7) 65.3 (10.0) 55.6 (9.7) 62.3 (7.7) 57.5 (9.4)
Pack-years 59.2 (28.6) 37.8 (20.3) 33.9 (20.2) 19.7 (13.6) 51.6 (30.2) 32.1 (24.8)
Current smoker (%) 53.3 39.6 54.0 41.2 51.4 40.1
FEV1,% predicted 48.6 (17.4) 96.8 (11.0) 46.9 (16.8) 94.9 (9.2) 46.3 (15.3) 107.9 (13.7)
Sex (% male) 61.8 49.3 64.6 50.1 75.7 57.9
  1. Data are presented as mean (SD) or percentage, as appropriate.
  2. Definition of abbreviations: CB chronic bronchitis, NHW non-Hispanic white.