The AQUA© questionnaire developed in 2008 is a validated tools for the screening of allergic diseases in adult athletes. The objective of the present study is to develop and validate a modified version of the AQUA© questionnaire to be used in childhood. In this phase, the validation is intended to assess the reliability of the information collected through the AQUA© modified version: question difficulty and response patterns with respect to children characteristics (in particular age, sex and physical activity). In particular, the focus will be on the "core questions", i.e. the indicators of allergic disorders. This is a cross-sectional study on 1264 healthy schoolchildren aged 8 to 14 years.

Inclusion Criteria:

• Aforementioned sex and age criteria.

Exclusion Criteria:

• Respiratory infections in the previous 3 weeks;
• Immunological or metabolic systemic disease;
• Major malformations of the upper airways;
• Active smoker.

The study population consists of 1264 healthy schoolchildren, both males and females, aged 8 to 14 years, recruited in 7 primary and secondary schools of the city of Palermo.