Table 1 Demographic and clinical data

Numbers of cases

36

Male

25

Age (years)

65 ± 12

Smokers

20

56

 current smokers

4

21

 ex-smokers

16

79

 smoking history (pack-years)

36 ± 27

Symptoms

29

81

 acute

8

28

 chronic

24

83

  cough

18

75

  exertional dyspnea

17

71

Pulmonary functional tests

27

75

 FEV₁/FVC < 0.7

15

55

  FEV₁ > 80%

3

11

  FEV₁ 50–80%

7

26

  FEV₁ < 50%

5

18

 TLC < 80% of predicted value

0

0

 FEV₁, % of predicted value

82 ± 33

 TLC, % of predicted value

103 ± 29