Participant characteristics (n=2450)
| n | % | |
| Adolescents (n=1500) | ||
| Age (mean=14.96, SD=1.44) | – | – |
| Gender | ||
| Male | 742 | 49.5 |
| Female | 753 | 50.2 |
| Choose not to identify | 5 | 0.3 |
| Smoking status | ||
| Smoker | 265 | 17.7 |
| Non-smoker | 1179 | 78.6 |
| Unknown | 56 | 3.7 |
| Neighbourhood SES | ||
| Low | 450 | 30.0 |
| Middle | 571 | 38.1 |
| High | 479 | 31.9 |
| Mother’s highest level of formal education | ||
| No formal education or primary | 191 | 12.7 |
| Secondary/high school | 981 | 65.4 |
| Technical school, university or postgraduate | 316 | 21.1 |
| Unknown | 12 | 0.8 |
| Father’s highest level of formal education | ||
| No formal education or primary | 135 | 9.0 |
| Secondary/high school | 901 | 60.1 |
| Technical school, university or postgraduate | 427 | 28.5 |
| Unknown | 37 | 2.4 |
| Adults (n=950) | ||
| Age (mean=25.72, SD=5.32) | – | – |
| Gender | ||
| Male | 498 | 49.5 |
| Female | 503 | 50.1 |
| Choose not to identify | 4 | 0.4 |
| Neighbourhood SES | ||
| Low | 284 | 29.9 |
| Middle | 357 | 37.6 |
| High | 309 | 32.5 |
| Highest level of education | ||
| No formal education or primary | 33 | 3.5 |
| Secondary/high school | 580 | 61.0 |
| Technical school, university or postgraduate | 337 | 35.5 |
SES, socioeconomic status.