Development and reliability testing of a standardized questionnaire to assess psoriasis phenotype

Alison Ehrlich, Troy Koch, Bijal Amin, David J. Liewehr, Seth M. Steinberg, Maria L. Turner, Andrew Blauvelt

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Background: Psoriasis genetics researchers have utilized separate and widely differing survey instruments to capture clinical data to be utilized in genotype-phenotype studies, which make comparison and collaboration studies among these researchers difficult. Objective: The purpose of this study was to develop and validate a clinical survey instrument to facilitate future collaborative genotype-phenotype studies among psoriasis genetics researchers. Methods: The Delphi method was employed to obtain international consensus on components of the novel survey instrument. The survey was pretested for acceptability purposes, and then formally tested for reliability using 3 independent raters interviewing 48 subjects with psoriasis. Results: Data showed high or moderately high agreement for questions relating to place of birth (85% to 100% in agreement), family origin (κ = 0.48 -1.0), psoriasis history (κ = 0.66-1.0), patient medical history (κ = 0.76-1.0), distribution of lesions (κ = 0.73-1.0), precipitating factors (κ = 0.79-1.0), joint involvement (κ = 0.74-.91), and treatment history, including use of oral retinoids, methotrexate, and etanercept (κ = 0.73-1.0). Other parameters had lower degrees of agreement. Limitations: The time involved and the need for the rater to be a clinician with knowledge of psoriasis may preclude widespread use of this survey instrument. Conclusion: We developed a novel, reliable survey instrument that can be used to gather clinical information in a standardized manner from psoriasis patients participating in clinical and genetics research studies.

Original languageEnglish (US)
Pages (from-to)987.e1-987.e14
JournalJournal of the American Academy of Dermatology
Issue number6
StatePublished - Jun 2006
Externally publishedYes

ASJC Scopus subject areas

  • Dermatology


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