Table 4

 Adjusted odds ratios and 95% confidence intervals relating various combinations of variables to respiratory illnesses

Model 1Model 2Model 3Model 4
OR95% CIOR95% CIOR95% CIOR95% CI
Household gas cooking frequency
    1 meal/day1111
    2 meals/day0.990.54 to 1.790.980.53 to 1.831.070.54 to 2.101.280.64 to 2.59
    3 meals/day1.680.92 to 3.051.871.00 to 3.472.191.09 to 4.392.641.28 to 5.43
Exposure to passive smoking
    No1111
    Yes1.090.65 to 1.850.990.57 to 1.710.950.52 to 1.720.920.50 to 1.67
Gender
    Female111
    Male1.661.05 to 2.621.500.92 to 2.461.671.00 to 2.77
Age (years)
    0–1111
    2–31.660.83 to 3.331.550.75 to 3.231.670.79 to 3.52
    4–62.371.22 to 4.631.940.96 to 3.922.030.99 to 4.17
Parents’ job
    Non-white collar111
    White collar0.860.54 to 1.380.910.55 to 1.511.000.60 to 1.68
Extraction fan/hood in kitchen
    No11
    Yes0.360.09 to 1.480.270.06 to 1.19
Usually open window
    No11
    Yes1.160.63 to 2.151.260.67 to 2.35
Burn joss sticks
    No11
    Yes1.430.83 to 2.441.350.77 to 2.35
Stuffed soft toys at home
    No11
    Yes0.880.54 to 1.440.820.50 to 1.37
Pets at home
    No11
    Yes1.660.57 to 4.811.760.61 to 5.13
Estate
    B11
    A4.492.74 to 7.344.092.47 to 6.77
Self-satisfied with indoor air quality
    Yes1
    No2.951.76 to 4.96