Table 1.

Sociodemographic characteristics of the study sample

	n	%
Sex
Male	9285	49.2
Female	9587	50.8
Age
12	3739	9.5
13	1795	19.8
14	3856	20.4
15	3618	19.2
16	3672	19.5
17	2192	11.6
Immigration status
Non migrant	18,160	96.4
Migrant	684	3.6
School
Public	8288	43.9
Semi private	9772	51.8
Private	812	4.3
Region
North	2959	15.7
Center	3896	20.6
South	6262	33.2
Metropolitan	5755	30.5
Ethnicity
None	15,317	84.6
Indigenous	2787	15.4
Disability
No	15,900	84.3
Yes	2972	15.7