Validation and Interpretation of Short Form 12 and Comparison with Dermatology Life Quality Index in Atopic Dermatitis in Adults

Authors

Jonathan I. Silverberg, Northwestern University Feinberg School of Medicine
Joel M. Gelfand, University of Pennsylvania Perelman School of Medicine
David J. Margolis, University of Pennsylvania Perelman School of Medicine
Mark Boguniewicz, University of Colorado School of Medicine
Luz Fonacier, NYU Winthrop Hospital
Mitchell H. Grayson, The Ohio State University College of Medicine
Peck Y. Ong, Keck School of Medicine of USC
Zelma C. Chiesa Fuxench, University of Pennsylvania Perelman School of Medicine
Eric L. Simpson, Oregon Health & Science University

Document Type

Journal Article

Publication Date

10-1-2019

Journal

Journal of Investigative Dermatology

Volume

139

Issue

10

DOI

10.1016/j.jid.2019.03.1152

Abstract

© 2019 The Authors Quality-of-life assessments are not standardized in atopic dermatitis (AD). We sought to determine the validity of the Short Form (SF)-12, a generic quality-of-life assessment, in AD and compare its measurement properties with the Dermatology Life Quality Index (DLQI). A cross-sectional, population-based study of 3,495 adults was performed, including 602 adults who met the modified United Kingdom Working Party Criteria for AD. The SF-12 mental component score and the SF-Six Dimension (SF-6D) had a strong correlation with each other and moderate inverse correlations with the Patient-Oriented Eczema Measure, the Patient-Oriented Scoring Atopic Dermatitis, the Patient-Oriented Scoring Atopic Dermatitis–itch, the Patient-Oriented Scoring Atopic Dermatitis–sleep, and the Numerical Rating Scale of pain (Pearson correlations, P < 0.0001 for all). The SF-12 mental component score and the SF-6D showed good discriminant validity as judged by the analysis of variance and receiver operating curves. The SF-12 physical component score had weak correlations with AD severity assessments and poor discriminant validity. The DLQI had better convergent and discriminant validity than the SF-12. The SF-12 and the DLQI showed good internal consistency (Cronbach alpha, 0.89 and 0.94, respectively). Differential item functioning was found for items in the SF-12 and the DLQI. Floor effects were observed for the DLQI but not for the SF-12 mental component score, the SF-12 physical component score, and the SF-6D. Severity thresholds were selected. In conclusion, the SF-12 mental component score and the SF-6D showed good validity in AD but inferior construct validity compared with the DLQI.

APA Citation

Silverberg, J., Gelfand, J., Margolis, D., Boguniewicz, M., Fonacier, L., Grayson, M., Ong, P., Chiesa Fuxench, Z., & Simpson, E. (2019). Validation and Interpretation of Short Form 12 and Comparison with Dermatology Life Quality Index in Atopic Dermatitis in Adults. Journal of Investigative Dermatology, 139 (10). http://dx.doi.org/10.1016/j.jid.2019.03.1152