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Table 3 Adiposity outcomes sub-group analyses for participants who were overweight or obese (n = 129) at baseline

From: Assessing the sustained impact of a school-based obesity prevention program for adolescent boys: the ATLAS cluster randomized controlled trial

Outcomea Baseline, Mean (SE) 8-month, Mean (SE) Timeb p 18-month, Mean (SE) Timec p Adjusted difference in change, Mean (95 % CI)d Group-by-time p
BMI, kg.m−2
 Intervention 24.9 (.8) 25.2 (.8) .167 26.1 (.8) <.001 −.27 (−.93, .39) .414
 Control 25.4 (.7) 26.2 (.7) .002 26.9 (.7) <.001   
BMI z-score
 Intervention 1.93 (.17) 1.81 (.17) .015 1.80 (.17) .013 −.08 (−.22, .07) .305
 Control 1.96 (.14) 1.93 (.14) .540 1.91 (.14) .292   
Waist circumference, cm
 Intervention 89.7 (2.9) 88.5 (2.9) .111 89.1 (2.9) .413 −1.2 (−3.4, 1.0) .276
 Control 91.0 (2.4) 90.4 (2.4) .406 91.7 (2.4) .468   
  1. Abbreviations: BMI body mass index
  2. aAll models were adjusted for school clustering and participant’s household socio-economic status
  3. bWithin-group effect from baseline to 8-months
  4. cWithin-group effect from baseline to 18-months
  5. dGroup-by-time effect from baseline to 18-month