Table 1.

Overview of variables

Variable	Type	Definition
Individual-level variables − demographic and health
Agea	Metric	Age at time of program start
Gendera	Dichotomous	Gender; 1 = boy, 2 = girl
German nationality?	Categorical	Nationality; 1 = German, 2 = non-German
Group	Dichotomous	Group status; 0 = control, 1 = intervention
Physically active?	Dichotomous	Whether or not participant is physically active; 0 = no, 1 = yes
Body fat percentage	Metric	Body fat as share of total body mass, in %
BMI	Metric	Body mass index (measure of weight adjusted for height), in kg/m2
BMI-SDSa	Metric	BMI standard deviation score, according to Kromeyer-Hauschild et al. [29]
Relative maximal power outputa (Physical fitness)	Metric	Maximum power output in watts divided by weight in kg
Program-level variables
Parents weighed?	Binary	Whether or not parents have been weighted at program start and end; 0 = no, 1 = yes
Sub-team size	Metric	Number of children in respective sub-team
Sub-team gender homogeneity	Metric	Homogeneity from 0 to 100%, where 0% implies an equal share of males and females
Sub-team age range	Metric	Age of oldest member minus age of youngest member of sub-team (in years)

^aAvailability of this data point was a precondition for being part of the sample.