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Japanese version of the Dermatology Life Quality Index: validity and reliability in patients with acne.

Author information

1
Institute for Health Outcomes and Process Evaluation Research, Tokyo, Japan. n-takahashi@jcqhc.or.jp

Abstract

BACKGROUND:

Patient-reported quality of life is strongly affected by some dermatologic conditions. We developed a Japanese version of the Dermatology Life Quality Index (DLQI-J) and used psychometric methods to examine its validity and reliability.

METHODS:

The Japanese version of the DLQI was created from the original (English) version, using a standard method. The DLQI-J was then completed by 197 people, to examine its validity and reliability. Some participants completed the DLQI-J a second time, 3 days later, to examine the reproducibility of their responses. In addition to the DLQI-J, the participants completed parts of the SF-36 and gave data on their demographic and clinical characteristics. Their physicians provided information on the location and clinical severity of the skin disease.

RESULTS:

The participants reported no difficulties in answering the DLQI-J items. Their mean age was 24.8 years, 77.2% were female, and 78.7% had acne vulgaris. The mean score of DLQI was 3.99(SD: 3.99). The responses were found to be reproducible and stable. Results of principal-component and factor analysis suggested that this scale measured one construct. The correlations of DLQI-J scores with sex or age were very poor, but those with SF-36 scores and with clinical severity were high.

CONCLUSION:

The DLQI-J provides valid and reliable data despite having only a small number of items.

PMID:
16884543
PMCID:
PMC1557837
DOI:
10.1186/1477-7525-4-46
[Indexed for MEDLINE]
Free PMC Article

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