Abstract
With data from three monotherapy baricitinib phase III randomized clinical trials (RCTs), we conducted a posthoc mediator analysis to assess whether changes in itch or skin severity mediated the treatment effect over placebo on changes in health-related quality of life. In this analysis, baricitinib demonstrated significant improvement in the Dermatology Life Quality Index for which itch mediated approximately half of the changes at weeks 4 and 16.