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Table 1 Summary of demographics, spirometry, smoking history and medications1

From: Acute exacerbations of chronic obstructive pulmonary disease are associated with decreased CD4+ & CD8+ T cells and increased growth & differentiation factor-15 (GDF-15) in peripheral blood

Age (years)

Sex

FEV1 (% predicted)

Smoking (pack-years)

Smoking status

# of AE-COPD during enrollment

ICS use (Y/N)

Home oxygen (Y/N)

67

M

52

108

Active

1

Y

N

74

F

51

50

Former2

3

Y

N

73

M

50

115

Former

1

Y

Y

59

M

47

18

Former

1

Y

Y

72

M

36

39

Former

2

Y

Y

66

F

33

104

Active

1

Y

Y

72

M

31

120

Active

1

Y

Y

66

M

29

40

Active

1

N

N

77

M

28

50

Former

1

Y

N

58

M

26

25

Former

1

Y

N

65

M

21

40

Former

1

Y

Y

67

M

20

84

Active

1

Y

Y

69

M

14

98

Former

3

Y

Y

68.1 ± 5.61

11/2

33.7 ± 12.7

68.5 ± 36.9

8/5

1.38 ± 0.77

12/1

8/5

  1. 1Data are presented as average ± SD, except for sex ratios (M/F), smoking status (Former/ Active) and ICS use (Yes/No); M, male; F, female; ICS, inhaled corticosteroids; 2former smokers were defined as having quit for more than six months