Table 1. Distribution of the corrected data by variables under investigation.

Variable		Person-days data (%)*
Day	Weekdays	71.6
	Weekends	28.4
School day	Days with PE lessons	18.0
	Days without PE lessons	82.0
Season	Spring	30.4
	Summer	10.3
	Autumn	29.4
	Winter	29.9

* The categories of each variable add to 100%