Table 1 Characteristics of the study population (n = 3115)
%No
Breast feeding duration
    0 weeks16.9527
    1–16 weeks48.41507
    >16 weeks34.71081
Allergic mother28.2877
Allergic father30.3944
Gender (% girls)48.61514
Maternal education level
    Low21.2660
    Intermediate42.31318
    High36.51137
Maternal smoking during pregnancy15.5484
Any smoking in the house at 8 years16.5515
Born by caesarean section8.5261
MeanSD
Maternal age (years)30.63.8
Birth weight child (g)3527533