Table 1

 Characteristics of 10 year old Oslo children with otitis media, tonsillopharyngitis, and lower respiratory infections

CharacteristicsOtitis media n = 470Tonsillopharyngitis n = 737Lower respiratory infections n = 275Total study population n = 3406
The figures are given as percentages of affected participants in each category.
Gender
    Female53.051.644.749.1
    Male47.048.455.350.9
Atopic disease
    Child26.826.341.621.6
    Parents62.360.467.256.8
Siblings
    Yes88.388.685.187.7
    No11.711.414.912.3
Smoking by care-giver
    Yes30.929.331.628.8
    No69.170.768.471.2
Home dampness
    Yes37.439.238.932.7
    No62.660.861.167.3
Maternal education
    <12 years44.744.144.042.9
    12–15 years28.126.925.828.2
    >15 years24.727.325.827.1
Parental ethnicity
    Caucasian75.361.344.078.7
    African8.38.89.56.4
    Asian13.815.99.513.0