Characteristics of study population
| Characteristic | |
|---|---|
| Values are given as either frequency (%) or median (interquartile range). | |
| *Two patients smoked cigars, one smoked a pipe. | |
| Number of patients | 151 |
| Female sex (%) | 97 (64%) |
| Age (years) | 62 (54–72) |
| Nodule size (mm) | 12 (6–20) |
| Stage of primary tumour (%) | |
| I | 56 (37%) |
| II | 35 (23%) |
| III | 15 (10%) |
| IV | 25 (17%) |
| Staging data not available | 20 (13%) |
| Ever smoker (%) | 101 (67%) |
| Former smoker | 88 (58%) |
| Current smoker | 10 (7%) |
| Other tobacco products* | 3 (2%) |
| Pack years | 27 (13–56) |