Fig. 1From: Increased platelet activating factor levels in chronic spontaneous urticaria predicts refractoriness to antihistamine treatment: an observational studySerum levels of PAF (a) and PAF-AH (b) and PAF-AH to PAF ratio (c) in patients with CSU and NCs. PAF platelet activating factor, PAF-AH platelet activating factor acetylhydrolase, CSU chronic spontaneous urticaria, NC healthy normal control. p values were calculated by Mann–Whitney U-testBack to article page