Short and Mid-term Repeatability of Active Anterior Rhinomanometry (AAR) Measurements in Paediatric Age

Healthy volunteers (HC) The inclusion criteria for HC are: 1. Negative bronchodilator response; 2. No major nasal septum malformations. The exclusion criteria for HC are: 1. Upper airway infections in the previous 4 weeks; 2. Active smoker; 3. Lifetime history of asthma, rhinitis, or respiratory disease symptoms. Children with non allergic rhinitis (NAR) The inclusion criteria for NAR are: 1.T5SS\>5 in the last 4 weeks. The exclusion criteria for NAR are: 1. At least one positive skin prick test for aeroallergens; 2. Upper airway infections in the previous 4 weeks; 3. Active smoker; 4. Major nasal septum malformations. Rhinitis children, perennial allergy (PAR) The inclusion criteria for PAR are: 1. T5SS\>5 in the last 4 weeks. 2. At least one positive skin prick test for perennial aeroallergens; The exclusion criteria for PAR are: 1. At least one positive skin prick test for seasonal aeroallergens; 2. Upper airway infections in the previous 4 weeks; 3. Active smoker; 4. Major nasal septum malformations. Rhinitis children, seasonal allergy, outside season (OSR) The inclusion criteria for OSR are: 1. T5SS\>5 in the last 4 weeks. 2. At least one positive skin prick test for seasonal aeroallergens; The exclusion criteria for OSR are: 1. At least one positive skin prick test for perennial aeroallergens; 2. Upper airway infections in the previous 4 weeks; 3. Active smoker; 4. Major nasal septum malformations. Rhinitis children, seasonal allergy, within season (OSR) The inclusion criteria for OSR are: 1. T5SS\>5 in the last 4 weeks. 2. At least one positive skin prick test for seasonal aeroallergens; The exclusion criteria for OSR are: 1. At least one positive skin prick test for perennial aeroallergens; 2. Upper airway infections in the previous 4 weeks; 3. Active smoker; 4. Major nasal septum malformations.