Baseline and post-intervention mean scores (SD) or percentages for compliance with the MVPA guideline, minutes spend in MVPA, weight status and waist-circumference and unstandardized regression coefficients from the regression analyses with GI group as reference.

MVPA = moderate-to-vigorous physical activity, WC = waist circumference, GI = general information; SD = standard deviations; N = number of adolescents; k = number of classes; * = p<0.05; †multilevel linear or logistic regression analyses with class and individual as levels, adjusted for level of education.