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Baseline characteristics (n=193)
| Sex | male/female | 126/67 |
| Age | mean (range) | 56.5 (26–85) |
| TDSa) | mean (range) | 8.16 (5–10) |
| CO (ppm) | mean (range) | 17.3 (0–59) |
| BIb) | mean (range) | 871 (200–3000) |
| BDI-IIc) | mean (range) | 13.83 (0–57) |
| Underlying diseases | presence/absence | 184/9 |
| Psychological disorders | presence/absence | 25/168 |
a) TDS = Tobacco Dependence Screener
b) BI = Brinkman Index
c) BDI-II = Beck Depression Inventory-II
