Fig. 3. Changes in clinical parameters before and after 6 hours of NPT in non-AIT and AIT subjects. (A) Changes in nasal eosinophil counts. (B) Changes in sputum eosinophil counts. (C) Changes in FeNO. (D) Changes in FEV1%.

NPT, nasal provocation test; AIT, allergen immunotherapy treatment; FeNO, fractional exhaled nitric oxide; FEV1, forced expiratory volume in 1 second; H&E, hematoxylin and eosin.

^*P < 0.05; ^†P < 0.01; ^‡P < 0.001, comparisons in parameters before and after 6 hours after NPT were calculated by Wilcoxon signed-rank test; ^§Comparison between non-AIT and 156 weeks AIT groups (Mann-Whitney U test); ^‖Comparison among non-AIT and AIT groups (Kruskal-Wallis test).