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

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

Outcome^a	Baseline, Mean (SE)	8-month, Mean (SE)	Time^b p	18-month, Mean (SE)	Time^c 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

Abbreviations: BMI body mass index
^aAll models were adjusted for school clustering and participant’s household socio-economic status
^bWithin-group effect from baseline to 8-months
^cWithin-group effect from baseline to 18-months
^dGroup-by-time effect from baseline to 18-month

ISSN: 1479-5868