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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)

From: Increasing physical activity and decreasing sedentary activity in adolescent girls – The Incorporating More Physical Activity and Calcium in Teens (IMPACT) study

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)    
  1. 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.
  2. 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.