Effects of Body Mass Index (BMI), demographic and socioeconomic factors on organized physical activity (OPA) participation in children aged 6-15 years: a cross-sectional study comparing primary and secondary school children in Greece.

More analytically, the prevalence of participation in OPA was 62.3% (95% CI: 61.3–63.7%) in primary schools and 44.6% (95% CI: 42.7–47.4%) in secondary schools, reflecting a dramatic decrease in OPA participation from primary to secondary school and these differences were highly significant ( p < 0.001) (Table 2 ).

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