IL4 and asthma: No significant difference in the level of IL-4 was observed in nasal lavage fluid among patients with isolated AR (median [interquartile range (IQR)], 6.09 pg/ml [4.17‒17.02 pg/ml]), isolated asthma (6.75 pg/ml [3.20‒12.80 pg/ml]), and asthma comorbid AR (3.78 pg/ml [2.23‒9.18 pg/ml]; P = 0.116; Fig. 2A).