Fig. 2. NPT results. (A) The percentage of a positive response to NPT in non-AIT subjects and in those subjected to 16 weeks, 52 weeks, 104 weeks, or 156 weeks of AIT. (B) The percentage of different nasal responsiveness grade in the 5 groups. (C) Correlation between nasal responsiveness grade and AIT duration (D) Correlation between nasal responsiveness grade and baseline RQLQ score.

NPT, nasal provocation test; AIT, allergen immunotherapy; RQLQ, rhinoconjunctivitis quality of life questionnaire.