Table 4: Adjusted odds ratios and their 95% confidence intervals (CIs) for the association between sociodemographic and smoking-related variables and SHS exposure outside household.

FactorSHS outside households OR 95% CI
Exposed
Not exposed

Age (in years)
 <131762931.00Reference
 13–167798781.551.12–1.74
 >166294552.421.74–2.85
Sex
 Female6668971.00Reference
 Male9187291.701.40–2.07
School grade
 Intermediate7669771.00Reference
 Secondary8186491.741.39–1.85
Father’s education
 No formal education81761.00Reference
 Less than university7136840.920.74–1.26
 University or higher7908660.880.72–1.07
Mother’s education
 No formal education1101191.00Reference
 Less than university7938021.010.66–1.79
 University or higher6817050.990.50–1.24
Family structure
 One or both parents152415951.00Reference
 Neither60312.121.30–3.14
Smoking status
 Nonsmoker84613301.00Reference
 Smoker or former smoker7382964.123.34–4.60
Parents smoking
 Nonsmokers107613491.00Reference
 One or both are smokers5082772.291.94–2.71
Close friends smoking
 No62911881.00Reference
 Some of them smoke9554384.163.54–4.77
Knowledge about harmful effect of smoking
 No120711171.00Reference
 Yes3775090.680.58–0.80
Belief in harmful effects of SHS
 No5305721.00Reference
 Yes105410541.080.93–1.24

Each variable is adjusted by the other variables in the table.