Table 1.
Descriptive analysis
| All | Boys | Girls | |
| Smoking prevalence* P value <0.0001 | 16.6 | 15.4 | 17.9 |
| Smoking consumption* P value= 0.1780 | 1.150 | 1.130 | 1.170 |
| Smoking consumption >0* P value= 0.0002 | 6.360 | 6.390 | 6.099 |
| Visibility teacher smoking | |||
| Daily | 23.5 | 26.1 | 20.9 |
| Most days | 8.8 | 9.3 | 8.3 |
| Half of the days | 7.3 | 6.8 | 7.8 |
| Less than half days | 14.4 | 14.0 | 14.9 |
| Never | 46.0 | 43.8 | 48.2 |
| Friends smoke | 78.1 | 79.8 | 76.5 |
| Mother smokes | 32.1 | 31.3 | 33.0 |
| Father smokes | 32.8 | 32.4 | 33.1 |
| School type (public) | 69.8 | 70.1 | 69.6 |
| School programme | 75.9 | 76.2 | 75.6 |
| Male | 50.5 | 100.0 | 0.0 |
| Age 14 | 13.5 | 13.6 | 13.5 |
| Age 15 | 20.7 | 20.2 | 21.2 |
| Age 16 | 24.0 | 23.2 | 24.8 |
| Age 17 | 26.4 | 27.0 | 25.8 |
| Age 18 | 15.3 | 16.0 | 14.7 |
| Immigrant | 11.4 | 11.2 | 11.5 |
| Income | €16.5 | €18.0 | €14.9 |
| Working mother | 59.4 | 59.7 | 59.2 |
| Working father | 76.4 | 77.6 | 75.1 |
| Retired mother | 1.4 | 1.3 | 1.5 |
| Retired father | 4.1 | 3.8 | 4.4 |
| Bad relations mother | 2.4 | 2.1 | 2.8 |
| Bad relations father | 5.3 | 4.3 | 6.3 |
Sampling weights have been taken into account with the ‘svyset and svy’ commands. All figures indicate percentages except for smoking consumption and income.
*A two-sample t-test with unequal variances for the null hypothesis of equal mean among genders.