Univariate analysis of factors potentially associated with sRaw and FEV1/FVC values at 9 years of age.

Severe exacerbations were defined by the need for oral steroids or an emergency visit. Parental atopy was defined by the diagnosis of asthma or allergic rhinitis in the mother or father. Linear regression was used to compare continuous variables, and analysis of variance to compare groups. * p<0.05 when compared to reference group.