Do extra compulsory physical education lessons mean more physically active children--findings from the childhood health, activity, and motor performance school study Denmark (The CHAMPS-study DK).

The interaction term was also significant for CPM (p=0.002), and vigorous PA (p<0.001) and borderline significant for moderate PA (p=0.07) in boys during leisure time, reflecting that sports schools boys’ reduced PA level compared to normal schools boys’ was more evident at the second assessment year than at the first assessment year (Additional file 5 ).

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