Table 1 Demographic and clinical data of the study population (n = 25)

Age, year (n = 25) (mean ± SD)

67.5 (± 8.3)

Sex (M/F) (n = 25)

17/8

Smoking history

Ex smoker (n) %

13 (52%)

No smoker (n) %

11 (44%)

Smoker (n) %

1 (4%)

PY (mean ± SD)

25.4 (± 34.2)

MRC chronic dyspnea score

0.0 (n) %

2 (8%)

1.0 (n) %

8 (32%)

2.0 (n) %

8 (32%)

3.0 (n) %

6 (24%)

4.0 (n) %

1 (4%)

5.0 (n) %

0 (0%)