Data presented as mean (SD) for continuous variables, median (interquartile range [IQR]) for ordinal variables, and frequency (%) for categorical variables.

Abbreviations: ARIA: Allergic Rhinitis Impact on Asthma guidelines; BMI: Body Mass Index; CARAT: Control of Allergic Rhinitis and Asthma Test; GINA: Global Initiative for Asthma; FR: France; IT: Italy; AT: Austria