Table 3

Baseline Values and Intervention Effects for Before/After School Activities, Weekend Activities, and Sedentary Activities as measured by the SAPAC for the IMPACT Cohort (N = 11 schools)

Variable

Baseline Mean (SD)

Follow-Up Mean^a (SE)

Difference^b

95% CI

P-Value

Before/After School Activity and Daily Weekend Activity

Daily Before School Activity Minutes

C

7.50 (11.05)

6.54 (0.80)

1.83 ↑

1.76 – 1.90

0.10

I

7.00 (11.87)

8.37 (0.78)

Daily After School Activity Minutes

C

60.83 (37.92)

61.89 (3.23)

8.95* ↑

8.69 – 9.21

0.04*

I

62.50 (40.60)

70.84 (3.15)

Daily Weekend Activity Minutes

C

102.00 (77.87)

107.00 (7.37)

19.00*↑

18.40 – 19.60

0.05*

I

102.50 (76.50)

126.00 (6.93)

Sedentary Activities

Daily TV and Video Minutes

C

90.62 (83.37)

106.81 (4.59)

12.11*↓

11.74 – 12.48

0.05*

I

113.72 (89.27)

94.70 (4.40)

Daily Computer/Video Games Minutes

C

23.16 (38.31)

44.36 (3.29)

6.32 ↓

6.05 – 6.60

0.16

I

23.49 (36.34)

38.04 (3.12)

Total Daily Sedentary Activity Minutes

C

113.78 (97.77)

151.91 (5.95)

16.99*↓

16.49 – 17.50

0.04*

I

137.22 (99.23)

134.92 (5.68)

^a Adjusted follow-up value in a mixed model with individual student modeled as random effect and school as nested random effect; time and condition as fixed effects; covariates include ethnicity, menstrual status, body mass index, participation in 7^th grade PE/athletics, neighborhood safety, family and friend support for physical activity.

^b Adjusted difference at follow-up between intervention (I) and control (C); adjusted for baseline scores of variable, ethnicity, menstrual status, body mass index, participation in 7^th. Grade PE/athletics, neighborhood safety, family and friend support for physical activity.

Jones et al. International Journal of Behavioral Nutrition and Physical Activity 2008 5:42   doi:10.1186/1479-5868-5-42