Table 1 Characteristics of the study population^a

(n = 321)

(n = 149)

(n = 172)

Age (years)

12.3 (2.21)

12.0 (2.24)

12.5 (2.15)

0.017

Weight (kg)

47.6 (14.6)

46.4 (14.4)

48.6 (14.8)

0.174

Height (cm)

1.52 (0.13)

1.52 (0.15)

1.52 (0.11)

0.917

BMI (kg/m²)

20.2 (4.03)

19.7 (3.46)

20.6 (4.42)

0.031

BMI z score

0.57 (1.25)

0.61 (1.27)

0.53 (1.24)

0.589

Waist circumference (cm)

70.0 (10.6)

70.2 (10.5)

69.8 (10.7)

0.700

WHtR (cm/cm)

0.46 (0.06)

0.46 (0.06)

0.46 (0.06)

0.494

 Total physical activity (min/d)

167 (92.8)

182 (93.1)

154 (90.8)

0.007

 MVPA (min/d)³

120 (76.6)

134 (77.5)

108 (73.8)

0.002

 Walking (min/d)

40.7 [23.6;66.4]

45.0 [27.9;66.4]

40.7 [23.6;66.4]

0.511

 Schoolyard active play (min/d)^c

10.7 [10.7;32.1]

10.7 [10.7;32.1]

10.7 [8.04;23.6]

0.067

 Non-school active play (min/d)^d

38.6 [17.1;60.0]

45.0 [21.4;68.6]

32.1 [15.0;53.6]

0.017

 Physical education (min/d)

4.29 [4.29;4.29]

4.29 [4.29;4.29]

4.29 [4.29;4.29]

0.133

 Team sport (min/d)

27.9 [4.29;51.4]

34.3 [12.9;55.7]

15.0 [0.00;45.0]

< 0.001

 Individual sport (min/d)

15.0 [0.00;40.7]

12.9 [0.00;45.0]

16.1 [2.14;36.4]

0.707

 Total physical activity (min/d)

151 (95.1)

159 (96.4)

144 (93.6)

0.579

 MVPA (min/d)

107 (78.2)

114 (79.2)

101 (77.1)

0.135

 Walking (min/d)

40.7 [23.6;62.1]

45.0 [23.6;62.1]

36.4 [23.6;57.9]

0.579

 Schoolyard active play (min/d)^c

10.7 [6.43;32.1]

10.7 [10.7;32.1]

10.7 [0.00;28.9]

0.049

 Non-school active play (min/d)^d

32.1 [15.0;57.9]

32.1 [15.0;60.0]

32.1 [12.9;54.1]

0.333

 Physical education (min/d)

4.29 [2.14;4.29]

4.29 [4.29;4.29]

4.29 [2.14;4.29]

0.009

 Team sport (min/d)

15.0 [0.00;42.9]

25.7 [0.00;45.0]

12.9 [0.00;36.4]

0.039

 Individual sport (min/d)

12.9 [0.00;36.4]

10.7 [0.00;32.1]

15.0 [0.00;39.1]

0.180