Der f-sNOI and its relationship with (A) Der f-sIgG4; (B) Der f-sBAT; (C) Der f-sIgE; and (D) subject's age (P=0.157). No significant relationships were found. The red and blue arrows indicate extreme cases of Der f-sIgG levels (highest and lowest, respectively).

Abbreviations: BAT, basophil activation test; Der f, Dermatophagoides farinae; NOI, neutrophil oxidative index.