Table 1. Socio-demographic Data.
| Parameter | Entire sample | TT | CT | CC |
|---|---|---|---|---|
| N = 1705 | N = 492 | N = 846 | N = 367 | |
| Age in years (SD) | 35.3 (13.1) | 34.7 (13.1) | 35.2 (12.9) | 36.4 (13.7) |
| % Females | 56.8 | 53.7 | 58.6 | 56.9 |
| Years of school education (SD) | 11.7 (1.6) | 11.8 (1.6) | 11.7 (1.6) | 11.7 (1.7) |
| % smokers | 46.9 | 48.6 | 45.5 | 48 |
| Exhaled CO in parts per million (SD) | 6.8 (9.5) | 7.5 (10.3) | 6.3 (8.9) | 6.9 (9.6) |
| FTND# (SD) | 3.1 (2.6) | 3.0 (2.6) | 3.0 (2.5) | 3.4 (2.8) |
| Age of onset (years) # (SD) | 16.1 (3.5) | 16.3 (3.5) | 16.0 (3.4) | 16.0 (3.6) |
| Cigarettes per life time§ (SD) | 6.4 (10.1) | 6.9 (12.0) | 6.0 (9.0) | 6.9 (9.9) |
#Only obtained in smokers.
§Only obtained in never-smokers.