Table 5. Total nasal symptom scores for V1 and V3 at the 60-minute time point are used as base of operation to determine the improvement rate in percent. The p-value was calculated applying a t-test. „Improvement“ in the table means fewer symptoms using Respiray in comparison to symptom severity without a filter.

Allergen	Mean value – baseline (V1)	Mean value – with filter (V3)	Improvement rate (%)	p-value
Birch	2.30	1.09	53	0.00307
HDM	3.19	1.59	50	0.00098
Cat	3.44	1.29	62	0.00311