Statistical analysis
Chemical concentrations were dichotomized at the 90th percentile, with the exception that when the detection rate was low, the concentrations were grouped into detectable and undetectable.
Cfu were categorized into four levels: 0 cfu/m3, 1–499 cfu/m3, 500–999 cfu/m3, and X1000 cfu/m3.
Der p1 and Der f1 were summed into one variable (Der 1), and exposure to dust mite
allergens of X2 mg/g was defined as exposure.
Statistical analysisChemical concentrations were dichotomized at the 90th percentile, with the exception that when the detection rate was low, the concentrations were grouped into detectable and undetectable. Cfu were categorized into four levels: 0 cfu/m3, 1–499 cfu/m3, 500–999 cfu/m3, and X1000 cfu/m3. Der p1 and Der f1 were summed into one variable (Der 1), and exposure to dust miteallergens of X2 mg/g was defined as exposure.
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