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Receiver operating characteristic curve analysis for the percent change in peak nasal inspiratory flow (PNIF; A), minimal cross-sectional area (MCA; B), and total nasal volume (TNV; C) before and after a nasal challenge with Dermatophagoides pteronyssinus (DP) allergen extract. _15, 15 minutes after the DP challenge; _30, 30 minutes after the DP challenge.
