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Background
Treatments for upper facial lines (UFL), the most visible sign of aging, are of interest to patients and clinicians alike. Patient‐reported outcomes (PROs) are valuable in evaluating the impact of such treatments; however, regulatory recommendations have stipulated that the patient perspective be central in developing these assessments.
Objectives
(1) To evaluate the content validity...
The importance of content validity in developing patient reported outcomes (PRO) instruments is stressed by both the US Food and Drug Administration and the European Medicines Agency. Content validity is the extent to which an instrument measures the important aspects of concepts that developers or users purport it to assess. A PRO instrument measures the concepts most significant and relevant to...
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