Table 1 Descriptive analysis. National Growth and Health Study

Parental education level, n (%)

≤ High school

194 (18.7 %)

339 (30.3 %)

Some college

320 (30.9 %)

540 (48.3 %)

<0.01

≥4-year college

521 (50.3 %)

239 (21.4 %)

HAQ scores (MET-times/wk), mean ± SD

  Age 10 years

33.3 ± 18.9

30.4 ± 19.5

<0.01

  Age 12 years

25.5 ± 15.7

23.1 ± 15.8

<0.01

  Age 14 years

22.7 ± 15.9

17.4 ± 13.5

<0.01

  Age 16 years

13.9 ± 14.3

6.1 ± 10.1

<0.01

  Age 17 years

11.7 ± 14.0

5.4 ± 10.3

<0.01

  Age 18 years

15.6 ± 15.7

7.0 ± 11.8

<0.01

  Age 19 years

17.9 ± 19.8

7.2 ± 13.0

<0.01

TV viewing hours (hours/wk), mean ± SD

  Age 10 years

24.9 ± 14.1

35.9 ± 17.0

<0.01

  Age 12 years

27.4 ± 15.8

45.8 ± 16.6

<0.01

  Age 14 years

24.9 ± 14.7

41.6 ± 16.8

<0.01

  Age 16 years

19.6 ± 14.3

39.1 ± 18.9

<0.01

  Age 17 years

17.9 ± 14.8

36.6 ± 19.7

<0.01

  Age 18 years

17.4 ± 15.4

36.3 ± 20.3

<0.01

  Age 19 years

18.9 ± 16.6

38.9 ± 20.2

<0.01