BMI: additional data
Study	Study population	Intervention group	Control Group	Measurement period	Overall effect	Comment
Before or after school programme
Carlin 2018	Female students, aged 11 to 13 years old	Brisk walking intervention	Continued with normal PA habits	12 weeks	No between group differences	BMI values not reported
				6 months	No between group differences
Enhanced PE
Ardoy 2011	Students age 12 to 14, enrolled in first year of secondary school	I1: 4 sessions/week of PE I2: 4 sessions/week of PE with emphasis on increasing intensity	2 sessions/week of PE	16 weeks	No between group differences	BMI values not reported
Multi‐component intervention
Burke 1998	—	I1: standard PA and nutrition program including classroom lessons, fitness sessions daily, and nutrition program I2: I1 plus a PA enrichment program for higher‐risk children	No program	9 months	Significant difference between I1 and control group in boys only, P = 0.016 No significant difference between I1 and control in girls, or I2 and control	No BMI values reported
				15 months	No significant differences between groups for boys or girls
Ickovics 2019	Grades 5 and 6 students	I1: PA school wellness policy I2: PA + nutrition school wellness policy	C1: Nutrition school wellness policy C2: delayed control	3 years	No significant group by time interaction P = 0.94	No BMI values reported
Salmon 2008	Grade 5 students (approximately 10 to 11 years old)	I1: behavioral modification group I2: fundamental motor skills group I3: combined behavioral modification and fundamental motor skills group	Usual classroom lessons	1 school year	Adjusted BMI/sex‐age population median I1: MD ‐0.40 (95% CI ‐1.11, 0.30) kg/m2 I2: MD ‐0.50 (95% CI ‐1.25, 0.25) kg/m2 I3: MD ‐1.30 (95% CI ‐2.29, ‐0.31) kg/m2	BMI/sex‐age population median not kg/m2 or z‐score
Suchert 2015	Students age 12 to 17 years	Multilevel intervention targeting students, classrooms, schools, and parents	No intervention	12 weeks	—	BMI percentile, not kg/m2 or z‐score
				1 year	BMI percentile: MD 1.09 (95% CI −0.64, 2.82), P = 0.215
Schooltime PA
Donnelly 2017	Grades 2 and 3 students	Academic Achievement and Physical Activity Across the Curriculum lessons, 160 min/week of MVPA	Traditional classroom instruction and typical PE schedule	3 years	BMI percentile (change from baseline): MD ‐2.3, 95% CI: ‐4.8, 0.2	BMI percentile, not kg/m2 or z‐score
Kobel 2014	Pupils at primary school, grades 1 and 2	Teacher training, PA education, and active breaks	No intervention	1 year	Adjusted BMI percentile (change from baseline): MD 0.5, 95% CI: ‐0.5, 1.5	BMI percentile, not kg/m2 or z‐score
Williamson 2007	Students in grades 2 to 6	Healthy Eating and Exercise program to increase PA during the school day and at home	Alcohol/Drug/Tobacco abuse prevention program	2 years	No between group differences, P = 0.5458	BMI values not reported