Table 1 Descriptive characteristics and unadjusted physical activity data of participants (M ± SD except weight status)

Demographic variables

All (n = 98)

Boys (n = 58)

Girls (n = 40)

All (n = 125)

Boys (n = 41)

Girls (n = 84)

Age (yr)

10.6 (0.3)

10.6 (0.4)

10.7 (0.3)

10.7 (0.3)

10.7 (0.3)

10.7 (0.3)

IMD score

17.6 (10.3)

17.5 (9.9)

17.7 (10.9)

18.8 (11.7)

18.3 (13.3)

18.7 (10.6)

Anthropometric variables

Stature (cm)

142.8 (7.0)

142.4 (7.0)

143.4 (7.3)

143.8 (7.7)

141.5 (7.3)

143.4 (7.3)

Body mass (kg)

35.7 (7.7)

35.5 (7.6)

35.8 (8.0)

38.9 (9.3)*

36.5 (9.1)

40.2 (9.2)

BMI z-score

−0.01 (1.2)

0.1 (1.1)

−0.2 (1.3)

0.4 (1.3)*

0.3 (1.5)

0.4 (1.2)

Maturity offset (yr)

−2.4 (1.0)

−3.1 (0.5)

−1.3 (0.6)**

−1.8 (1.1)

−3.1 (0.5)

−1.2 (0.6)**

Weight status variables

% Normal weight

87.8%

87.9%

87.5%

75.8%

80.5%

73.5%

% Overweight

10.2%

8.6%

12.5%

18.5%

17.1%

19.3%

% Obese

2.0%

3.4%

0.0%

5.6%

2.4%

7.2%

Physical activity variables

PA count·min^-1

594.3 (131.5)

610.4 (150.6)

569.6 (91.6)

414.0 (75.8)

422.5 (68.4)

409.5 (79.5)

Daily MPA (min)

43.7 (12.2)

45.8 (12.0)

40.5 (11.8)

35.7 (8.6)

36.3 (8.5)

35.4 (8.6)

Daily VPA (min)

23.2 (9.7)‡

24.2 (10.0)

21.8 (9.1)

16.9 (6.4)

18.2 (6.4)

16.2 (6.4)

School time MPA (min)

17.6 (4.9)‡

18.9 (4.7)

15.6 (4.4)

14.8 (4.4)

15.0 (3.8)

14.7 (4.6)

School time VPA (min)

10.8 (4.0)‡

11.2 (4.2)

10.2 (3.6)

8.5 (3.9)

9.0 (3.1)

8.2 (4.3)

Out of school MPA (min)

26.1 (9.6)‡

27.1 (9.7)

24.6 (9.4)

21.1 (6.4)

21.7 (7.0)

20.8 (6.1)

Out of school VPA (min)

12.3 (7.0)‡

13.0 (7.2)

11.3 (6.8)

8.6 (3.8)

9.6 (4.4)

8.0 (3.3)

Before school MPA (min)

3.8 (2.8)††

3.6 (2.2)

4.1 (3.4)

3.0 (1.8)

2.9 (1.7)

3.1 (1.9)

Before school VPA (min)

1.2 (1.3)

1.3 (1.2)

0.9 (1.5)

0.8 (0.9)

0.9 (1.1)

0.7 (0.8)

Class time MPA (min)

10.3 (3.3)†

11.2 (3.4)

8.9 (2.6)

9.0 (2.9)

9.1 (2.9)

8.9 (2.9)

Class time VPA (min)

6.3 (2.4)†

6.6 (2.6)

5.8 (2.1)

5.3 (2.5)

5.8 (2.3)

5.1 (2.6)

Recess MPA (min)

1.3 (0.8)

1.2 (0.8)

1.4 (0.9)

1.2 (0.9)

1.3 (0.7)

1.2 (0.9)

Recess VPA (min)

0.9 (0.7)

0.8 (0.7)

1.0 (0.8)

0.8 (0.8)

0.9 (0.8)

0.8 (0.8)

Lunchtime MPA (min)

6.0 (2.3)

6.5 (2.3)

5.3 (2.0)

4.6 (2.0)

4.5 (1.9)

4.6 (2.1)

Lunchtime VPA (min)

_{3.6 (2.3)‡}

3.8 (2.4)

3.4 (2.0)

2.3 (1.8)

2.3 (1.7)

2.3 (1.9)

After school MPA (min)

15.2 (5.4)‡

15.8 (5.5)

14.2 (5.1)

10.4 (3.5)

9.8 (3.5)

10.7 (3.5)

After school VPA (min)

7.9 (4.6)‡

8.2 (4.8)

7.4 (4.3)

3.7 (1.9)

3.4 (1.7)

3.8 (2.0)