Table 5

 Adjusted odds ratios and 95% confidence intervals of exposure to household gas cooking in respiratory illnesses, stratified by estate*

Estate AEstate B
OR95% CIOR95% CI
*Adjusted for gender, age, parents’ job, extraction fan/hood in kitchen, burning joss-sticks, stuffed soft toys, pets at home, opening windows, and self-satisfaction with indoor air quality.
Household gas cooking frequency
    1 meal/day11
    2 meals/day0.780.31–1.983.190.92–11.04
    3 meals/day1.720.64–4.606.121.73–21.59
Exposure to passive smoking
    No11
    Yes1.110.46–2.680.810.33–1.97