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Table 3 Baseline characteristics of COPD subjects with chronic bronchitis (CB) and those without CB within each cohort

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

  COPDGene NHWs GenKOLS ECLIPSE
CB No CB CB No CB CB No CB
N 844 1968 311 552 507 1257
Age, years 62.8 (8.3) 65.5 (8.0) 65.3 (10.0) 65.7 (10.1) 62.3 (7.7) 64.2 (6.8)
Pack-years 59.2 (28.6) 55.1 (27.6) 34.0 (20.4) 30.9 (17.3) 51.6 (30.2) 49.8 (26.2)
Current smoker (%) 53.3 26.7 54.0 42.8 51.4 28.5
FEV1,% predicted 48.6 (17.4) 50.1 (18.2) 46.9 (16.8) 52.7 (17.5) 46.3 (15.3) 48.2 (15.7)
Sex (% male) 61.8 53.0 64.6 57.6 75.7 63.5
  1. Data are presented as mean (SD) or percentage, as appropriate.
  2. Definition of abbreviations: CB chronic bronchitis, NHW Non-Hispanic white.