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Table 1 Descriptive data for the study population: children (3–9 years) and adolescents (10–17 years), Belgium 2014–2015

From: Physical activity and sedentary behavior in Belgium (BNFCS2014): design, methods and expected outcomes

Characteristics Valid data Excluded
Children
(n = 676)
Adolescents
(n = 573)
Children
(n = 387)
Adolescents
(n = 391)
Gender
 Males 50.7 % 49.2 % 53.0 % 48.1 %
 Females 49.3 % 50.8 % 47.0 % 51.9 %
Family education levela    *(P < 0.0001) *(P = 0.02)
 No, primary or secondary school 30.2 % 36.8 % 43.9 % 46.8 %
 Higher school short type 34.5 % 29.3 % 25.3 % 25.1 %
 Higher school long type 34.0 % 31.4 % 28.4 % 26.3 %
BMIb
 Underweight 8.7 % 9.6 % 8.3 % 9.7 %
 Normal 77.8 % 72.8 % 73.6 % 70.1 %
 Overweight 10.4 % 12.4 % 13.4 % 15.1 %
 Obese 3.1 % 4.9 % 4.7 % 4.4 %
Average age (years) 6.68 (±1.96) 14.01 (±2.35) 6.30 (±1.96)** 14.20 (±2.25)
Average number of valid days 6.30 (±1.01) 6.16 (±1.09) --- ---
  1. aFamily education level (i.e., the highest education level of the parents) was not available for 1.3 % of the children and 2.4 % of the adolescents with valid data, as well as for 2.3 % of the children and 0.8 % of the adolescents excluded
  2. bBMI (Body Mass Index) was not available for 0.4 % of the adolescents with valid data and for 0.8 % of the adolescents excluded
  3. *Significantly (P < 0.05) different from children/adolescents with valid data, based on chi-square tests; **Significantly (P < 0.05) different from children with valid data, based on a t-test