Table 1

Participant Characteristics

Age 5

Age 8

Age 11

Age 13


Boys

Girls

Boys

Girls

Boys

Girls

Boys

Girls


(n = 205)

(n = 229)

(n = 193)

(n = 222)

(n = 171)

(n = 211)

(n = 168)

(n = 189)


Age (yr)

5.2 ± 0.4

5.3 ± 0.5*

8.7 ± 0.6

8.7 ± 0.6

11.2 ± 0.3

11.2 ± 0.3

13.3 ± 0.4

13.3 ± 0.4


Height (cm)

112 ± 6

111 ± 6

134 ± 7*

132 ± 7

149 ± 8

149 ± 8

163 ± 10*

160 ± 7


Weight (kg)

21 ± 4

20 ± 4

33 ± 10

32 ± 9

45 ± 13

44 ± 12

58 ± 16

56 ± 15


Fat Mass (kg)

3.9 ± 2.1

4.6 ± 2.4*

8.0 ± 6.3

9.2 ± 5.9

12.7 ± 9.2

14.2 ± 8.7*

15.4 ± 11.6

17.9 ± 10.6*


% BFa

18.8 ± 5.3

22.8 ± 6.0*

22.6 ± 9.3

27.7 ± 8.8*

26.4 ± 10.9

30.5 ± 9.9*

23.4 ± 12.6

29.3 ± 9.9*


MVPA (minutes · day-1)b

31.5 ± 15.9*

24.5 ± 13.1c

38.6 ± 21.2*

25.9 ± 15.5d

42.0 ± 22.1*

22.7 ± 13.9

31.6 ± 18.1*

19.5 ± 13.1e


TV (≥ 2 hr · day-1)f (%)

58

56

50

51

63

50

64

52


VG (≥ 1 hr · day-1)f (%)

22

12

42

14

60

32

66

34


Values are presented as mean ± SD.

SD, standard deviation.

a Percentage of body fat determined by DXA scan.

b moderate-to-vigorous physical activity.

c n = 228.

d n = 221

e n = 187.

Response categories: (1) < 1 hr · day-1 or not at all; (2) ≥ 1 hr · day-1 but < 2 hr · day-1; (3) ≥ 2 hr · day-1 but < 3 hr · day-1;

(4) ≥ 3 hr · day-1 but < 4 hr · day-1; and (5) ≥ 4 hr · day-1.

* Age-specific comparison of boys and girls using Student's t-test (p < 0.05).

Age-specific comparison of boys and girls using the Cochran-Armitage trend test (p < 0.05).

Francis et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8:100   doi:10.1186/1479-5868-8-100

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