Table 1 Characteristics of the analyzed groups

COPD (335)

67.9 ± 9.2

248/87^b

55.5 ± 18.5^b

52.2 ± 16.0^b

100^b

CTR (309)

68.0 ± 6.6

80/229

91.7 ± 22.8

89.2 ± 25.8

35.5

CTR smokers (110)

68.4 ± 5.2

73/37

93.3 ± 22.0

91.1 ± 19.5

100

CTR non-smokers (199)

65.8 ± 9.6

157/42

91.0 ± 23.6

88.1 ± 28.7

0

COPD^a (60)

70.4 ± 9.0

13/47^b

46.6 ± 18.5^b

58.1 ± 16.4^b

100^b

CTR^a (61)

67.8 ± 6.7

46/15

90.4 ± 22.5

92.6 ± 23.2

37.7

CTR smokers^a (23)

67.7 ± 5.6

15/8

93.2 ± 21.9

88.2 ± 16.4

100

CTR non-smokers^a (38)

67.9 ± 7.6

31/7

90.6 ± 22.0

90.7 ± 18.0

0