Table 1. Sociodemographic characteristics of the studied population. ERICA, Brazil, 2013-2014.

Variable	n	%
Gender
Female	41,225	55.3
Male	33,364	44.7
Age (years)
12-14	34,151	45.8
15-17	40,448	54.2
Type of school
Public	58,707	78.7
Private	15,882	21.3
School shift
Morning	53,353	71.5
Afternoon	21,236	28.5
Geographical region
North	15,073	20.2
Northeast	23,167	31.1
Midwest	9,727	13.0
Southeast	17,080	22.9
South	9,542	12.8