Table 2

 Sociodemographic characteristics of subjects in two estates

Estate AEstate BTotal*p value
No.%No.%
*Some variables have missing values.
Gender0.04
    Female6342.914453.5207
    Male8457.112546.5209
    Subtotal147269416
Age (years)0.63
    0–12717.56122.488
    2–35334.410639.0159.0
    4–67448.110538.6179
    Subtotal154272426
Parents’ job0.92
    White collar7146.112445.6195
    Blue collar8353.914854.4231
    Subtotal154272426
Household gas cooking frequency0.94
    1 meal/day3522.76022.195
    2 meals/day6542.212044.1185
    3 meals/day5435.19233.8146
    Subtotal154272426
Exposure to passive smoking0.80
    Yes3221.16022.192
    No12078.921177.9331
    Subtotal152271423
Respiratory disease<0.001
    Yes6845.34316.4111
    No8254.721983.6301
    Subtotal150262412