Table 1 Descriptive participant characteristics (Mean ± SD) for Dutch adolescent boys and girls separately.

Age, yrs

12.9 ± 0.5*

Ethnicity, %

   Western

84.3

   Non-Western

15.7

Height, cm

159.7 ± 8.2

163.0 ± 8.6)*

166.4 ± 8.7*

170.8 ± 8.5*

Weight, kg

49.0 ± 10.1

52.0 ± 10.6)

55.2 ± 11.1

58.8 ± 10.8

BMI, kg/m²

19.1 ± 2.9

19.5 ± 2.9)

19.8 ± 3.0

20.0 ± 2.7*

Weight status, %

   Healthy weight

78.9

81.7

80.1

84.0

   Overweight (obese)

19.4 ± 1.7

16.6 ± 1.)

16.7 ± 3.0

14.4 ± 1.7)

WC, cm

68.1 ± 7.6

69.0 ± 7.2

69.7 ± 7.5

72.8 ± 8.1)*

HC, cm

82.3 ± 7.4*

84.2 ± 7.6*

87.0 ± 7.5*

86.1 ± 7.0)*

Skinfold thickness, mm

41.6 ± 20.7*

41.2 ± 21.8*

40.5 ± 21.9*

43.7 ± 22.0)*

Shuttle run, laps

8.6 ± 2.1*

9.0 ± 2.2*

9.3 ± 2.3*

9.4 ± 2.4)*

TV viewing, min/day

174.9 ± 97.6

141.6 ± 85.9

141.5 ± 76.8

148.4 ± 83.1)*

Computer use, min/day

132.6 ± 85.1*

124.7 ± 88.2

132.7 ± 81.3

132.4 ± 89.0)

Girls

Age, yrs

12.7 ± 0.5)

Ethnicity, %

   Western

89

   Non-Western

11

Height, cm

158.8 ± 6.7

161.4 ± 6.4

163.3 ± 6.1

165.1 ± 5.9

Weight, kg

49.4 ± 10.7

52.3 ± 11.0

54.2 ± 10.6

57.0 ± 10.8

BMI, kg/m²

19.5 ± 3.4

20.0 ± 3.5

20.3 ± 3.4

20.9 ± 3.6

Weight status, %

   Healthy weight

78.2

81.6

80.1

79.8

   Overweight (obese)

17.5 (4.3)

15.5 (2.9)

16.8 (3.1)

16.2 (4.0)

WC, cm

67.2 ± 8.0

68.9 ± 8.1

68.7 ± 8.0

70.4 ± 8.4

HC, cm

85.3 ± 8.4

87.9 ± 9.0

89.8 ± 8.8

91.4 ± 8.3

Skinfold thickness, mm

55.1 ± 27.1

56.0 ± 26.8

54.6 ± 22.4

68.7 ± 28.7

Shuttle run, laps

7.2 ± 1.9

7.5 ± 1.8

7.6 ± 1.9

7.6 ± 2.0

TV viewing, min/day

156.4 ± 95.3

134.8 ± 89.8

133.6 ± 73.9

123.5 ± 69.0

Computer use, min/day

103.8 ± 78.3

119.7 ± 95.4

128.4 ± 88.6

126.0 ± 82.1