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Table 1 Descriptive characteristics of the samples, HBSC study, Czech Republic 2002–2014

From: Trends and correlates of overweight/obesity in Czech adolescents in relation to family socioeconomic status over a 12-year study period (2002–2014)

  2002 2006 2010 2014
  Boys Girls Boys Girls Boys Girls Boys Girls
  (n=2345) (n=2567) (n=2332) (n=2297) (n=2008) (n=2113) (n=2183) (n=2405)
  % % % % % % % %
Chronological agea
 11 years 34.1 33.1 31.4 31.2 32.6 30.6 29.9 30.3
 13 years 32.5 33.8 33.5 33.9 31.4 35.2 33.9 34.4
 15 years 33.4 33.1 35.0 34.9 36.0 34.2 36.2 35.3
Family affluence
 Low 34.2 40.5 25.7 30.3 13.1 17.0 32.4 34.4
 Medium 56.5 53.0 54.9 55.9 54.2 53.3 44.3 45.4
 High 9.3 6.5 19.4 13.8 32.7 29.7 23.3 20.2
Weight status
 Normal weight 81.6 91.7 78.0 83.8 73.8 88.1 74.9 87.9
 Overweight/obese 18.4 8.3 22.0 16.2 26.2 11.9 25.1 12.1
Daily MVPA
  ≥ 60 min 32.2 23.1 27.6 18.0 28.1 18.9 25.6 18.9
Daily screen time
  > 2 h per weekday 75.3 85.9 87.9 88.8 61.3 73.4 81.7 77.0
  > 2 h per weekend day 78.3 65.0 88.6 79.8 89.8 84.7 91.7 84.0
  1. MVPA – moderate-to-vigorous physical activity; Screen time – amount of time spent watching television or using a computer; a 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)