Table 6 Odds ratios (OR) of developing two or more respiratory symptoms† according to baseline characteristics in asymptomatic subjects at baseline (using multivariate logistic regression analysis).

Characteristics	OR (95% CI)
Factors
AHR ⩽8 v >8 mg/ml	8.33 (2.65 to 26.16)***
Non‐specific rhinitis	2.35 (0.90 to 6.11)*
Rhinitis to animals	2.14 (0.81 to 5.64)
Rhinitis to pollen	0.67 (0.24 to 1.84)
Family history of asthma	1.15 (0.38 to 3.48)
Interaction terms
Family history of asthma × rhinitis to pollen	6.31 (1.25 to 31.89)**

*p<0.1; **p<0.05; ***p<0.01.

†At least two of the following symptoms: wheezing, shortness of breath, chest tightness, cough, respiratory complaints upon exertion.