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Table 1 Demographic characteristics of the study population, stratified by weight status

From: Cross-sectional and longitudinal associations between physical activity, sedentary behaviour and bone stiffness index across weight status in European children and adolescents

 Main sample aSubsample b
Thin/normal weightOverweight/obeseThin/normal weightOverweight/obese
(N = 1627)(N = 381)(N = 833)(N = 204)
Age (Mean, SD) c6.02 (1.81)6.64 (1.66)6.35 (1.73)6.83 (1.63)
Sex (N, %) c
 Boys911 (83.8)176 (16.2)435 (83.2)88 (16.8)
 Girls716 (77.7)205 (22.3)398 (77.4)116 (22.6)
Family socio-economic status (N, %) c
 Low142 (68.3)66 (31.7)69 (70.4)29 (29.6)
 Medium893 (79.0)238 (21.0)500 (80.0)125 (20.0)
 High592 (88.5)77 (11.5)264 (84.1)50 (15.9)
Pubertal status (N, %) d
 Pre or early pubertal343 (78.3)95 (21.7)174 (78.7)47 (21.3)
 Pubertal180 (64.8)98 (35.4)128 (72.3)49 (27.7)
Country (N, %) c
 Belgium278 (93.0)21 (7.0)68 (93.1)5 (6.9)
 Estonia274 (84.3)51 (15.7)183 (89.3)22 (10.7)
 Germany472 (85.2)82 (14.8)310 (85.4)53 (14.6)
 Hungary112 (88.9)14 (11.1)45 (83.3)9 (16.7)
 Italy259 (60.7)168 (39.3)85 (52.5)77 (47.5)
 Spain116 (81.1)27 (18.9)124 (78.5)34 (21.5)
 Sweden116 (86.6)18 (13.4)18 (81.8)4 (18.2)
  1. aMain sample included participants with full information of self-reported physical activity and sedentary behaviour as well as co-variables. bSubsample included the participants with full information of accelerometer data as well as co-variables. cData from baseline survey; dData from six-year follow-up survey