Longitudinal Observational Study in Prematurely Born Preschool Children: Assessment of Lung Function Parameters

Case group Inclusion Criteria: * Premature birth \< 37 weeks * 5 years old ≤ Age ≥ 3 years old Control group Inclusion Criteria: * Full-term birth * 5 years old ≤ Age ≥ 3 years old Exclusion Criteria of both groups: * Pulmonary bronchodysplasia (BDP) * Acute respiratory infection * Immunological and metabolic system disease * Malformation of upper respiratory tract * Topical or systemic therapies, with antibiotics, antihistaminics and corticosteroids, in the previous 30 days * Patients with neurological pathologies * Patients that are not able to perform the lung function tests