Table 1: Characteristics of the studied adolescents by sociodemographic variables and SHS exposure.

VariableSHS exposure value
ExposedNot exposed
Number%Number%

Exposure
 Outside household104932.7216167.3
 At home158449.3162650.7
 Overall80125.0240975.0
Smoking status
 Nonsmoker36516.8181183.20.00
 Smoker or former smoker43642.259857.8
Age (in years)
 <1321345.425654.60.00
 13–1691955.573844.5
 >1670064.638435.4
Sex
 Female80951.875448.20.00
 Male102362.162437.9
School grade
 Intermediate91252.383147.70.00
 Secondary92062.754737.3
Father’s education
 No formal education9661.16138.90.01
 Less than university83359.656440.4
 University or higher90354.575345.5
Mother’s education
 No formal education12755.510244.50.33
 Less than university93158.466441.6
 University or higher77455.861244.2
Family structure
 One or both parents176756.7135243.30.00
 Neither6571.42628.6

Significant difference.