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Methods. Regression analysis.

Figure S1. Distribution of the included children across mainland Portugal.

Table S1. Comparison between the Portuguese population aged 3–5 years, the predicted sample and the true sample, considering region and age.

Table S2. Study questionnaire.

Table S3. Sources of the included questions.

Table S4. Comparison between children with and without ‘current rhinitis’, ‘physician-diagnosed rhinitis’ and ‘rhinoconjunctivitis’.

Table S5. Comparison between children without rhinitis and those with different forms of current rhinitis, considering the ARIA classification.

Table S6.Univariate (unadjusted) and multivariate (adjusted) analysis for risk of ‘current rhinitis’, ‘physician-diagnosed rhinitis’ or ‘rhinoconjunctivitis’ (multivariate analysis included only possible risk factors). Statistically significant results are presented in bold.

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