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Table 1 Descriptive characteristics of the samples, HBSC study, Czech Republic 2002–2018

From: Time-trends and correlates of obesity in Czech adolescents in relation to family socioeconomic status over a 16-year study period (2002–2018)

  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
  1. §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