High house dust mite serum-specific immunoglobulin E indicates a high 5-year rhinitis-asthma conversion rate: a cross-sectional study

The individuals involved in the analysis met the following criteria: all suffered from AR; having recurrent nasal itching, sneezing, rhinorrhea, and hyperemia; having definite living environment (basement, bungalow, or apartment); clearly diagnosed as AA or not; all sIgE tests of house dust mites were conducted; all kinds of inhaled allergens are tested for the skin. sIgE was measured using ImmunoCAP (Phadia1000, Thermofisher Scientific, Uppsala, Sweden). sIgE with a value of 0.35 kU/L or more (0.35–100 kU/L) was considered sIgE-positive. sIgE was divided into six degrees: level 1, values ≥0.35 and