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
Not exposed

Age (in years)
School grade
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
Smoking status
 Smoker or former smoker7382964.123.34–4.60
Parents smoking
 One or both are smokers5082772.291.94–2.71
Close friends smoking
 Some of them smoke9554384.163.54–4.77
Knowledge about harmful effect of smoking
Belief in harmful effects of SHS

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