Table 1.

Sociodemographic characteristics of the sample.

Variables	Frequency	Percentage
Gender
Female	1395	53.0
Male	1229	47.0
Participation in sports clubs
Yes	1021	38.9
No	1603	61.1
Participation in non-organized PA
Yes	1496	57.0
No	1128	43.0
Parents who play sports
Yes	1277	48.7
No	1347	51.3
Academic achievement
One or more fails	1225	46.7
No fails	1399	53.3

PA: physical activity.