Using the Vitiligo Noticeability Scale in clinical trials: construct validity, interpretability, reliability and acceptability.

Background: Validated outcome measures are needed for vitiligo trials.

Objectives: To assess construct validity, interpretability, reliability and acceptability of the Vitiligo Noticeability Scale (VNS).

Methods: We used images of vitiligo before and after treatment, plus outcome data, from the HI-Light Vitiligo trial.