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Table 3 Characteristics of the 710 non-participating adolescents from participating classes compared to participating adolescents in HELENA study #

From: Main characteristics and participation rate of European adolescents included in the HELENA study

CITIES Sex ratio (M/F) Age(years) (mean ± SD) BMI (kg/m 2) (mean ± SD)
Non-participants Participating adolescents Non-participants Participating adolescents Non-participants Participating adolescents
Athens NA 51/49 NA 13.9 ± 1.2 NA 21.8 ± 3.8
Dortmund 40/60 43/57 15.0 ± 1.0 15 ± 1.4 21.2 ± 5.2 21.8 ± 4.2
Ghent 49/51 54/46 15.0 ± 1.5 15 ± 1.3 20.9 ± 3.6 20.3 ± 3.2
Heraklion NA 54/46 NA 14 ± 1.3 NA 23.2 ± 4.5
Lille 57/43 58/42 13.8 ± 1.4 14.4 ± 1.2 19.5 ± 6.2 20.5 ± 3.7
Pecs NA 50/50 NA 15 ± 1.2 NA 21.4 ± 3.6
Roma 40/60 60/40 15.2 ± 1.6 15.5 ± 1.7 21.8 ± 4 22.2 ± 4.0
Stockholm 47/53 61/39 14.1 ± 1.2 15 ± 1.4 20.9 ± 3.2 20.5 ± 3.2
Vienna 44/66 51/49 15.1 ± 1.4 15.3 ± 1.5 22.2 ± 5.1 21.7 ± 3.7
Zaragoza 43/57 51/49 14.6 ± 1.2 14.6 ± 1.3 20.5 ± 1.9 21.6 ± 3.3
TOTAL 320/390 53.3/46.7NS 16.6 ± 1.2** 14.8 ± 1.2NS 21.1 ± 4.2** 21.5 ± 3.9** NS
  1. # Data collected from 2006 to 2007.
  2. NA = Not Available; NS : Not significant for t-test; ** for available data.