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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