An increasing trend of asthma incidence by birth year has already been described in this study [ 52 ] and is now also found for AR.
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The sentences
Crude risks by birth month in ECRHS I main were also not increased, while in the adjusted analysis only September (OR 0.75; 0.56–1.01) and October (OR 0.75; 0.56–1.00) reached borderline significant reduced risks compared to birth month January.