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Selection procedure. SOPHYA study, Switzerland, 2013–2015. §: Weekend compliers: ≥ 60 min spent in moderate-to-vigorous physical activity on weekend day in average. §§ Data processing issues: low frequency filtering instead of no filtering or 60-s instead of 15-s epoching. §§§: Missing data in age, school, out-of-school or family factors. Percentages were calculated using the baseline sample size as denominator.
