Table 1.

Clinical Covariates of the APT in 2 Multicenter Studies With Different Allergen Standardization

	Skin Prick		sIgE		APT		History
	A	B	A	B	A	B	A	B
D. pteronyssinus	59	56	56	56	34	39	52	34
Cat dander	54	44	49	46	12	10	23	30
Grass pollen	65	57	75	59	18	15	33	31
Birch pollen	65	49	65	53	11	17	13	20

A indicates German multicenter[57] (7 centers, N = 253 adults, 3000-10,000 PNU/g); B, European multicenter[59] (6 countries, 12 centers, N = 314, 200 IR/g). Values are expressed as percentages.