Table 2

Descriptive statistics for age, physical activity, and screen time [mean (SE)] (Waves II and III)a

MALES

FEMALES


Wave II

Wave III

Wave II

Wave III


Not Obese

Obese

Not Obese

Obese

Not Obese

Obese

Not Obese

Obese


Count

4529

550

3831

1048

3823

453

3289

987

Age

16.0 (0.12)

15.9 (0.19)

21.5 (0.11)

21.6 (0.14)

15.8 (0.12)**

16.0 (0.14)**

21.2 (0.12)**

21.5 (0.13)**

MVPA (bouts/wk)b

4.1 (0.06)**

3.7 (0.13)**

2.5 (0.04)

2.5 (0.09)

3.4 (0.07)**

2.9 (0.12)**

2.1 (0.05)

2.0 (0.08)

MVPA (change)b

--c

--c

-0.3 (0.01)**

-0.2 (0.02)**

--c

--c

-0.2 (0.01)

-0.1 (0.02)

Screen Time (hrs/wk)d

19.3 (0.45)*

21.8 (1.11)*

18.7 (0.40)

20.3 (0.82)

15.9 (0.53)**

20.3 (1.19)**

15.3 (0.39)*

21.2 (0.96)*

Screen Time (change)d

--c

--c

-0.7 (0.44)

-0.4 (0.97)

--c

--c

-0.2 (0.49)**

2.0 (0.98)**


* Significant difference by obesity status within wave and gender (p < 0.05). ** Significant difference by obesity status within wave and gender (p < 0.01).

a National Longitudinal Study of Adolescent Health [N = 9,155]. Weighted for national representation, standard errors corrected for survey design effects of multiple stage cluster sampling

b MVPA = moderate to vigorous physical activity. MVPA (change) = (Wave III MVPA) - (Wave II MVPA)

c Variable is not applicable for Wave II.

d Screen Time = hours/week of television and video viewing. Screen Time (change) = (Wave III Screen Time) - (Wave II Screen Time)

Boone et al. International Journal of Behavioral Nutrition and Physical Activity 2007 4:26   doi:10.1186/1479-5868-4-26

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