Table 2.

Results of SPT using dog or cat dander allergen extracts according to allergic symptoms on dog and cat exposure.

	SPT with dog allergen (n = 424)		P-value∗	SPT with cat allergen (n = 305)		P-value∗
	Symptomatic groupa (n = 89)	Non-symptomatic group (n = 335)		Symptomatic groupa (n = 205)	Non-Symptomatic group (n = 100)
MWD, mm
Product (A)	1.1 ± 1.6	0.6 ± 1.3	0.010	2.7 ± 2.8	1.0 ± 1.9	< 0.001
Product (B)	0.9 ± 1.7	0.5 ± 1.3	0.061	1.4 ± 1.9	0.6 ± 1.4	< 0.001
Product (C)	1.7 ± 2.2	1.2 ± 1.8	0.043	3.1 ± 3.1	1.4 ± 2.3	< 0.001
A/H ratio
Product (A)	0.3 ± 0.6	0.1 ± 0.3	0.008	0.6 ± 0.7	0.2 ± 0.6	< 0.001
Product (B)	0.2 ± 0.6	0.1 ± 0.3	0.018	0.2 ± 0.4	0.1 ± 0.3	0.004
Product (C)	0.6 ± 0.9	0.3 ± 0.5	0.003	0.8 ± 0.9	0.3 ± 0.6	< 0.001
Positivity, %
Positive if any wheal observed
Product (A)	29 (32.6)	60 (17.9)	0.003	57 (57.0)	52 (25.4)	< 0.001
Product (B)	24 (27.0)	54 (16.1)	0.019	41 (41.0)	34 (16.6)	< 0.001
Product (C)	41 (46.1)	123 (36.7)	0.107	60 (60.0)	72 (35.1)	< 0.001
Positive if MHD ≥3 mm
Product (A)	23 (25.8)	42 (12.5)	0.002	48 (48.0)	44 (21.5)	< 0.001
Product (B)	15 (16.9)	39 (11.6)	0.190	30 (30.0)	26 (12.7)	< 0.001
Product (C)	29 (32.6)	82 (24.5)	0.122	55 (55.0)	55 (26.8)	< 0.001
Positive if A/H ratio ≥1
Product (A)	8 (9.0)	13 (3.9)	0.057	26 (26.0)	16 (7.8)	< 0.001
Product (B)	8 (9.0)	12 (3.6)	0.046	10 (10.0)	6 (2.9)	0.009
Product (C)	25 (28.1)	43 (12.8)	<0.001	34 (34.0)	27 (13.2)	< 0.001

Data are shown as mean ± SD or frequency (%).

∗P-value < 0.05 is shown as boldface in comparing variables between subjects with allergic symptoms on dog exposure and those without it or between subjects with allergic symptoms on cat exposure and those without it. SPT, SPT, skin prick test; MWD, mean wheal diameter provoked by allergen in skin prick test; A/H ratio, allergen-to-histamine mean wheal diameter ratio.

^aSubjects who experienced symptoms of allergic rhinitis, allergic conjunctivitis, skin allergy, asthma, and cough during exposure to dog or cat