Title

Evaluating Clinical Rating Scales for Evidence-Based Dermatology: Some Basic Concepts

Document Type

Article

Publication Date

10-2005

Journal

Dermatologic Clinics

Volume

23

Issue

4

First Page

703

Last Page

706

URL with Digital Object Identifier

http://dx.doi.org/10.1016/j.det.2005.05.004

Abstract

Evidence-based dermatology has necessitated the development of rating scales that measure multidimensional and abstract constructs, such as quality of life. This article discusses some basic psychometric concepts, such as reliability, validity, standardization, and measurement precision, which need to be considered when choosing a clinical rating instrument. Also discussed is the impact of these parameters on increasing the statistical power of a clinical trial.