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Plasma biomarker levels in each prurigo nodularis (PN) cluster and healthy controls. IL-4, IL-22, and IL-6 were dichotomized to binomial (positive/negative) variables using their detection limits as the cutoff. Biomarkers are expressed as violin plots with median ± interquartile range or bar plots with proportion ± standard error. PN – prurigo nodularis; * – P < 0.05; ** – P < 0.01; *** – P < 0.001.
