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.
Atopic disease
Smoking by care-giver
Home dampness
Maternal education
    <12 years44.744.144.042.9
    12–15 years28.126.925.828.2
    >15 years24.727.325.827.1
Parental ethnicity