Table 2: Relationship of environmental allergen concentrations to allergen sensitization.

AllergenConcentrationaN SensitivitybP value

CockroachAbove median3747%0.71
Below median14452%
dust miteAbove median6360%0.17
Below median11871%
mouseAbove median8136%0.15
Below median10025%
Alternaria Above median9058%0.32
Below median9149%
indoor moldAbove median9049%0.55
Below median9254%
outdoor moldAbove median9154%0.55
Below median9149%
endotoxinAbove median6951%0.81
Below median7155%
β-GlucanAbove median5448%0.29
Below median5560%

aMedian concentrations: cockroach—0.2 U/g (lower limit of detection), dust mite—0.1  g/g (LLOD), mouse—0.03  g/g (LLOD), Alternaria—13.7  g/g (LLOD), indoor mold—514 spores/m3, outdoor mold—3840 spores/m3, endotoxin—12 EU/mg, β-Glucan—0.4  g/g. Cat and dog exposure were determined via a yes/no questionnaire item.
bFor indoor allergens (cockroach, dust mite, mouse, Alternaria, cat, and dog), sensitivity is indicated by a positive skin test to the given allergen (wheal at least 3 mm greater than the negative control). For mold, endotoxin, and β-Glucan, sensitivity is indicated by 4 or more positive skin tests out of 14 mold skin tests measured.