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Table 2 Intervention Effects as Measured in 2002, Relative to Baseline (2000) for Selected Key Physical Activity Endpoints 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
WBPA (Daily Weight Bearing Minutes)      
C 85.66 (58.13) 87.05 (3.74) 5.12 ↑ 4.82 – 5.42 0.33
I 87.11 (51.92) 92.17 (3.64)    
WBPA (Number of Daily Weight Bearing Activities)      
C 3.12 (1.95) 3.18 (0.14) 0.25 ↑ 0.23 – 0.27 0.23
I 3.19 (1.39) 3.43 (0.14)    
Total Daily Minutes of Activity      
C 102.63 (65.32) 104.30 (4.24) 6.15 ↑ 5.81 – 6.49 0.30
I 103.55 (61.82) 110.45 (4.13)    
MVPA (Daily Moderate to Vigorous Physical Activity Minutes)      
C 64.63 (53.93) 63.63 (3.63) 7.05 ↑ 6.75 – 7.35 0.16
I 64.85 (47.23) 70.68 (3.53)    
Total Daily Minutes of Vigorous Activity      
C 14.96 (28.39) 14.35 (2.24) 6.00↑ 5.82 – 6.18 0.05*
I 14.00 (29.33) 20.35 (2.18)    
Daily Total Weight Bearing Adjusted MET Value (mins)      
C 400.01 (284.17) 415.53 (20.29) 43.27↑ 41.62 – 44.92 0.13
I 411.68 (303.51) 458.80 (19.71)    
Daily Total Moderate to Vig. Activity Adjusted MET Value (mins)      
C 380.53 (330.81) 383.07 (22.90) 40.74 ↑ 38.88 – 42.60 0.20
I 382.25 (307.92) 423.81 (22.24)    
  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.
  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.