Table 1 Patient characteristics.

Age, median (range)

73 (50–83)

Sex, n (%)

Male

12 (70.6)

Female

5 (29.4)

Smoking history, n (%)

Never

6 (35.3)

Ever

11 (64.7)

Brinkman index (BI), n (%)

Never smoker

6 (35.3)

0 < BI < 200

1 (5.9)

200 ≤ BI < 600

1 (5.9)

600 ≤ BI

9 (52.9)

COPD, n (%)

Positive

5 (29.4)

Negative

12 (70.6)

Body mass index (BMI), n (%)

BMI < 18.5

3 (17.6)

18.5 ≤ BMI < 25

14 (82.4)

25 ≤ BMI

0 (0)