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 Meana (SE) | Differenceb | 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 7th 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 7th. Grade PE/athletics, neighborhood safety, family and friend support for physical activity.