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Open Access Research article

DLQI scores in vitiligo: reliability and validity of the Persian version

Shahin Aghaei1*, Manouchehr Sodaifi1, Peyman Jafari2, Nazila Mazharinia3 and Andrew Y Finlay4

Author Affiliations

1 Department of Dermatology, Shiraz University of Medical Sciences, Shiraz, Iran

2 Department of Biostatistics, Shiraz University of Medical Sciences, Shiraz, Iran

3 Burn Hospital, Shiraz University of Medical Sciences, Shiraz, Iran

4 Department of Dermatology, University of Wales College of Medicine, Cardiff CF4 4XN, UK

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BMC Dermatology 2004, 4:8  doi:10.1186/1471-5945-4-8

Published: 4 August 2004

Abstract

Background

The objective of this study was to translate and to test the reliability and validity of the 10-item Dermatology Life Quality Index (DLQI) questionnaire in Iranian patients with vitiligo.

Methods

Using a standard "forward-backward" translation procedure, the English language version of the questionnaire was translated into Persian (the Iranian official language) by two bilinguals. Seventy patients with vitiligo attending the Department of Dermatology, Saadi Hospital, Shiraz, Iran, were enrolled in this study.

The reliability and internal consistency of the questionnaire were assessed by Cronbach's alpha coefficient and Spearman's correlation, respectively. Validity was performed using convergent validity.

Results

In all, seventy people entered into the study. The mean age of respondents was 28.3 (SD = 11.09) years. Scores on the DLQI ranged from 0 to 24 (mean ± SD, 7.05 ± 5.13). Reliability analysis showed satisfactory result (Cronbach's α coefficient = 0.77). There were no statistically significant differences between daily activity (DA) and personal relationship (PR) scale mean scores in generalized versus focal-segmental involvement in sufferers (P = 0.056, P = 0.053, respectively). There were also strong differences between the mean scores of the PR (personal relationship) scale with the involvement of covered only and covered/uncovered areas (P= 0.016) that was statistically significant in the second group.

Conclusions

The study findings showed that the Persian version of the DLQI questionnaire has a good structural characteristic and is a reliable and valid instrument that can be used for measuring the effects of vitiligo on quality of life.