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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.