Characteristics of the study sample
| Number | % | |
|---|---|---|
| *At baseline for details see Tobacco Control 2003;12:74–8. | ||
| Sex | ||
| Boys | 255 | 49.0 |
| Girls | 265 | 51.0 |
| Parental education index* | ||
| Compulsory school | 61 | 11.8 |
| College | 202 | 39.2 |
| University | 252 | 48.5 |
| Lifetime use of tobacco | ||
| None | 134 | 25.8 |
| Snus only | 54 | 10.4 |
| Smoking only | 114 | 21.9 |
| Snus and smoking | 218 | 41.9 |