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| Characteristic | N (%) | |
| Control group | 45 (100) | |
| Age in years: median (range) | 60 (30–80) | |
| Sex | Female | 15 (33) |
| Male | 30 (67) | |
| Active smokers | 40 (89) | |
| No pathological finding | 21 (47) | |
| Acute inflammation | 9 (20) | |
| Chronic inflammation | 8 (18) | |
| Mild dysplasia | 7 (15) | |
