The norwegian version of the psoriasis disability index--a validation and reliability study.

Full Abstract

OBJECTIVE:
The aim of this study was to translate the Psoriasis Disability Index (PDI) into Norwegian and validate it in a Norwegian setting. The PDI is a measure that was developed to assess the impact of psoriasis on the patient's life.

METHODS:
Two hundred and eighty-two patients with psoriasis were included in the study (80% outpatients, and 20% hospitalized).

RESULTS:
Face and content validity were assessed as satisfactory. The PDI seems to capture issues of importance to patients. The results indicate that the PDI does not capture a unidimensional concept. A factor analysis (principal component with orthogonal rotation) resulted in three factors (physical, social, and hygienic) that were substantially different. All three factors had satisfactory internal consistency. Altogether they explained 58% of the variance. In addition, there were differing patterns of correlations with external criteria, such as dimensions of SF-36, as well as with sex, age, and education.

CONCLUSIONS:
The PDI has been found to have acceptable reliability in this study. However, further validation is necessary to estimate the sensitivity to change.

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Author information

Author/s: Wahl, A K (AK); Wiklund, I (I); Moum, T (T); Hanestad, B R (BR);

Affiliation: Department of Public Health and Primary Health Care, University of Bergen, Norway. astrid.klopstad.wahl(-atsign-)hibu.no

Journal and publication information

Publication Type: Journal Article

Journal: Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research (Value Health), published in United States. (Language: eng)

Reference: -1999 Sep-Oct; vol 2 (issue 5) : pp 342-9

Dates: Created 2006/05/05; Completed 2006/05/25; Revised 2006/11/07;

PMID: 16674325, status: PubMed-not-MEDLINE (last retrieval date: 12/26/2008)

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