Association between SBS symptoms (weekly or sometimes) and Continuous OH-score (as a continuous variable, range from 0–7) (n = 4530).

aAdjusted for parents’ gender, parents’ history of asthma, allergic rhinitis or eczema and current smoker by logistic regression analyses. OR expressed for one unit change of the Continuous OH-score.Continuous OH-score: by adding the number of yes response (weekly or sometimes) to the following odor and humidity perceptions: (1) Stuffy odor; (2) Unpleasant odor; (3) Pungent odor; (4) Mold odor; (5) Tobacco smoke odor; (6) Humid air; (7) Dry air.