Proportion of asthma patients with history of allergy Allergic Hong Thai (n=200) Quoc Tuan (n=255) Total (n = 455) p n (%) History of allergy 77 96 173 38, 0 >0, 05 Allergic signs present or in history Sinus allergic rhinitis 35 41 76 16, 7 >0, 05 Itchy rash, urticaria 59 69 128 28, 1 >0, 05 Slow 3 0 3 0, 7 >0, 05 Drug allergy 8 7 15 3, 3 >0, 05 Food allergies 9 2 11 2, 4 <0, 05 Family factor 57 104 161 35, 4 <0, 05 Grandparents, foreigners 7 12 19 4, 2 >0, 05 Parents 30 48 78 17, 1 >0, 05 Siblings 10 13 23 5, 0 >0, 05 Children 10 31 41 9, 0 <0, 05 Comments: History of allergy in many patients (38.0%), urticaria, papular itching 28.1%; 16.7% allergic rhinitis.