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There is an unmet need for psychometrically sound instruments to measure pruritus associated with prurigo nodularis (PN). To evaluate the psychometric properties of the itch numeric rating scale (itch NRS), both the Worst Itch Numeric Rating Scale (WI-NRS) and the Average Itch Numeric Rating Scale (AI-NRS). This secondary analysis is based on a secondary end point of a phase 2 randomized clinical trial of serlopitant for treatment of pruritus associated with PN. This randomized, double-blind, placebo-controlled study was conducted at 15