Table 1 Baseline characteristics of the study patients
|  | All patients (n = 20) | Stage C (n = 9) | Stage D (n = 11) |
|---|---|---|---|
Male sex, n (%) | 20 (100%) | 9 (100%) | 11 (100%) |
Age, years | 67 (55, 81) | 65 (59, 81) | 68 (55, 81) |
Disease duration, years | 6.0 (1, 25) | 3.0 (1, 10) | 11 (2, 25) |
Smoker/former smoker, n (%) | 19 (95%) | 8 (88.9%) | 11 (100%) |
Smoking amount, pack-years* | 17.5 (0.0, 70.0) | 15.0 (0.0, 65.0) | 20.0 (3.0, 70.0) |
Had quit smoking, n (%)* | 19 (100%) | 8 (100%) | 11 (100%) |
Time since quitting smoking, years* | 9.5 (0.0, 39.0) | 6.0 (0.0, 39.0) | 10.0 (3.0, 24.0) |