Table 5. The disease duration of chronic urticaria according to clinical characteristics and laboratory findings.

Clinical characteristic	Disease duration (mo)	95% confidence
		Upper limit	Lower limit
Total patient with chronic urticaria	17.277	19.632	14.922
By sex
Male	18.539	22.158	14.919
Female	16.168	19.18	13.157
By age group
<18	6.017	7.595	4.548
≥18	17.301	19.673	14.929
<60	17.434	20.191	14.678
≥60	17.501	22.171	12.832
By accompanied symptom
With dermographism	18.256	21.501	15.012
Without dermographism	16.12	19.212	13.03
With angioedema	21.531	27.009	16.053
Without angioedema	17.069	19.608	14.53
By personal history of atopy
With atopic dermatitis	22.297	27.255	17.339
Without atopic dermatitis	16.43	18.843	14.017
With allergic rhinitis	14.434	17.553	11.315
Without allergic rhinitis	18.683	21.718	15.647
With asthma	16.784	23.901	9.668
Without asthma	17.045	19.418	14.673
By abonormal laboratory results
Eosinophil >4%	21.151	28.113	14.189
No Eosinophilia	18.669	22.668	14.671
Total IgE >100 IU/ml	12.696	14.861	10.531
Total IgE <100 IU/ml	19.108	27.095	11.121
WBC >10,000	9.353	14.123	4.947
WBC <10,000	19.355	22.969	15.742

IgE: immunoglobulin E, WBC: white blood cells.