Table 1.
Sociodemographic characteristics of the study sample (survey waves 2008, 2011, 2015, and 2018).
| Survey Wave | N | Males | Age | Socioeconomic Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 14 Years | 15 Years | 16 Years | 17 Years | 18 Years | Low | Medium | High | |||
| 2008 | 5213 | 51.6% | 19.2% | 20.0% | 20.0% | 20.5% | 20.4% | 25.8% | 47.4% | 26.8% |
| 2011 | 4829 | 51.6% | 19.8% | 19.5% | 19.7% | 19.8% | 21.2% | 21.9% | 46.8% | 31.3% |
| 2015 | 5077 | 51.7% | 20.5% | 19.8% | 20.0% | 19.8% | 19.8% | 21.2% | 47.3% | 31.5% |
| 2018 | 6824 | 51.8% | 20.2% | 20.1% | 20.3% | 19.6% | 19.9% | 19.9% | 48.4% | 31.7% |
| Total | 21,943 | 51.7% | 19.9% | 19.9% | 20.0% | 19.9% | 20.3% | 22.2% | 47.4% | 30.4% |