Table 1 Demographic characteristics for each disease group and the results of chi-square testing

Epilepsy, n = 775Asthma, n = 395Healthy controls, n = 362p Values
Values are percentages.
Sex0.001
    Male52.939.652.9
Race0.149
    White90.186.287.7
    Black4.66.94.2
    Asian/Pacific Islander1.41.5
    American Indian/Aleut/Eskimo1.21.30.9
    Other0.81.61.6
Hispanic origin4.03.23.80.849
Current age, y0.824
    18–2414.318.613.6
    25–3420.919.821.7
    35–4424.020.923.2
    45–5419.217.917.8
    55–6410.211.19.7
    65+11.511.714.0
Region0.347
    New England3.55.94.6
    Middle Atlantic11.614.115.9
    East North Central15.715.715.8
    West North Central4.56.17.9
    South Atlantic19.416.717.7
    East South Central7.25.75.9
    West South Central14.011.29.8
    Mountain7.46.86.0
    Pacific16.617.816.4
Population density0.288
    <100,00022.318.920.5
    100,000–499,99917.614.813.4
    500,000–1,999,99920.221.520.5
    2,000,000+40.044.745.6
Household size0.239
    1 member17.013.212.8
    2 members33.430.631.4
    3 members20.820.319.4
    4 members15.918.719.7
    5 or more members12.917.216.6
Household income0.001
    <$20,00037.023.214.6
    $20,000–$34,99922.819.117.1
    $35,000–$54,99916.320.021.6
    $55,000–$84,99912.918.922.3
    $85,000 and over10.918.824.5