Table 3 Descriptive statistics of the study sample of girls (N = 127)

Age

13.44 ± 1.25

13.22 – 13.66

Ethnicity

Native Dutch

114 (89.8%)

Non-native Dutch

13

Academic year

Grade 7

63 (49.6%)

Grade 9

64

School level

Senior general secondary education

29 (22.8%)

University preparatory education

98

SES

Low-medium

33 (26.2%)

High

93

BMI (kg/m ² )

19.31 ± 2.58

18.86 – 19.76

Depressive symptoms

12.76 ± 8.92

11.19 – 14.32

Total time spent moving per week including active commuting to school (min.)

809.31 ± 205.36

770.50 – 848.11

Active commuting to school (min./week)

223.55 ± 92.13

207.37 – 239.72

Time spent moving per week corrected for active commuting to school (min.)

585.72 ± 170.45

553.51 – 617.93

Active commuting to school as % of total time spent moving per week

27.76 ± 10.07

26.81 – 29.49

D2 Test of attention

178.76 ± 26.37

172.61 – 179.06

Symbol Digit Modalities Test

61.75 ± 9.87

58.83 – 61.40

Academic Achievement

7.06 ± 0.75

6.73 – 6.92

Mathematics performance

7.12 ± 1.08

6.84 – 7.10