Fig. 3. Proportion of the patients with chronic urticaria compare among negative, positive autologous serum skin test (ASST), positive autologous plasma skin test (APST), and both positive ASST and APST groups. Four-fold dose of H1- antihistamine during 4 weeks of treatment (A), short-course oral prednisolone (B), and third-line drug treatment during 2 years (C) were observed. (D) A Kaplan-Meier curve graph demonstrates the remission rate among the groups (n = 107). Statistical analysis was performed by Fisher exact test. ^*p < 0.05. ^**p < 0.01. ^***p < 0.001.