| | 2002 | | 2006 | | 2010 | | 2014 | | 2018† | |
|---|
| | Boys | Girls | Boys | Girls | Boys | Girls | Boys | Girls | Boys | Girls |
| n= | (2345) | (2567) | (2332) | (2297) | (2008) | (2113) | (2183) | (2405) | (5856) | (5773) |
| | % | % | % | % | % | % | % | % | % | % |
| Age category§ |
| 11 years | 34.1 | 33.1 | 31.4 | 31.2 | 32.6 | 30.6 | 29.9 | 30.3 | 32.7 | 32.8 |
| 13 years | 32.5 | 33.8 | 33.5 | 33.9 | 31.4 | 35.2 | 33.9 | 34.4 | 34.5 | 34.4 |
| 15 years | 33.4 | 33.1 | 35.1 | 34.9 | 36.0 | 34.2 | 36.2 | 35.3 | 32.8 | 32.8 |
| SES |
| Low | 34.2 | 40.5 | 25.7 | 30.3 | 13.1 | 17.0 | 32.4 | 34.4 | 23.7 | 27.2 |
| Medium | 56.5 | 53.0 | 54.9 | 55.9 | 54.2 | 53.3 | 44.3 | 45.4 | 45.3 | 44.6 |
| High | 9.3 | 6.5 | 19.4 | 13.8 | 32.7 | 29.7 | 23.3 | 20.2 | 31.0 | 28.2 |
| Weight status* |
| Non-overweight | 81.6 | 91.7 | 77.9 | 83.8 | 73.7 | 88.1 | 74.8 | 87.9 | 73.3 | 84.7 |
| 95% CI | 80.0–83.2 | 90.6–92.7 | 76.2–79.6 | 82.3–85.3 | 71.8–75.7 | 86.7–89.5 | 73.0–76.6 | 86.6–89.2 | 72.1–74.4 | 83.8–85.7 |
| Overweight | 14.5 | 6.5 | 14.2 | 11.8 | 18.7 | 9.5 | 18.1 | 9.3 | 17.9 | 11.9 |
| 95% CI | 13.1–16.0 | 5.6–7.4 | 12.8–15.6 | 10.5–13.1 | 17.0–20.4 | 8.3–10.7 | 16.5–19.7 | 8.2–10.5 | 16.9–19.0 | 11.0–12.7 |
| Obesity | 3.9 | 1.8 | 7.9 | 4.4 | 7.6 | 2.4 | 7.1 | 2.8 | 8.8 | 3.4 |
| 95% CI | 3.1–4.7 | 1.3–2.3 | 6.8–9.0 | 3.6–5.3 | 6.4–8.8 | 1.7–3.1 | 6.0–8.2 | 2.1–3.5 | 8.1–9.6 | 2.9–3.9 |
- §11 years (13 years and 15 years) includes adolescents in the age range 10.5–12.49 years (12.50–14.49 years and 14.50–16.49 years); † in the 2018 data analyses, the weights for strata (administrative regions) were applied; SES socioeconomic status; *obesity and overweight were represented by the >97th percentile and 85th–97th percentile, respectively, on gender-specific Body Mass Index-for-age growth charts [30, 31]; CI 95% confidence interval
