Table S1 Questions concerning the outcome variables and important covariates.

Table S2 Variables considered in the univariate analyses as potential risk factors for recurrent wheeze at age 4.5 years.

Table S3 Extended multivariate analyses for recurrent wheeze, multiple-trigger wheeze and episodic viral wheeze at 4.5 years of age.

Table S4 Responders vs. non-responders at age 4.5 years among the children who answered the questionnaire only at 6 months or 1 year of age.

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