Development of the Japanese Version of the Psoriasis Disability Index(PDI), the Psoriasis Specific QOL Index : Results of the Validation Study

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  • Fukuchi Osamu
    Department of Dermatology, The Jikei University School of Medicine
  • Finlay Andrew Y
    Department of Dermatology, Wales College of Medicine, Cardiff University, UK
  • Ohta Arihito
    Department of Dermatology, The Jikei University School of Medicine
  • Ishiji Takaoki
    Department of Dermatology, The Jikei University School of Medicine
  • Honda Mariko
    Department of Dermatology, The Jikei University School of Medicine
  • Kamide Ryoichi
    Department of Dermatology, The Jikei University School of Medicine
  • Nakagawa Hidemi
    Department of Dermatology, The Jikei University School of Medicine
  • Komine Mayumi
    Department of Dermatology, The University of Tokyo Hospital
  • Hasegawa Tomonori
    Department of Social Medicine, Toho University School of Medicine

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Other Title
  • 乾癬特異的QOL指標Psoriasis Disability Index（PDI）日本語版の開発と信頼性・妥当性の検討
  • カンセントクイテキ QOL シヒョウ Psoriasis Disability Index PDI ニホンゴバン ノ カイハツ ト シンライセイ ダトウセイ ノ ケントウ

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In order to develop a psoriasis specific, health-related QOL (quality of life) index in Japan, we developed a Japanese version of the Psoriasis Disability Index (Japanese PDI) and examined its reliability and validity by examining its relevance to the comprehensive health-related QOL index, SF-36 (short form-36). In creating the Japanese PDI, we first made a draft which adhered to general methods of QOL questionnaire development and completed it using a feasibility study with 5 psoriasis patients. We conducted a validation study in 200 psoriasis patients to examine its reliability, validity and responsiveness ; they responded to both the Japanese PDI and the SF-36. It took about 2 minutes to complete the Japanese PDI. The missing value (unanswered) rate for each of the 15 question categories of the Japanese PDI questionnaire was below 10%. The questionnaire shows good reliability with Cronbach’s coefficient alpha at 0.910. In factor analysis, eigen values were high (>1.0) for factors explaining“leisure/treatment,” “work/school,” “daily activities,” and “personal relationships.” A sufficient correlation coefficient of –0.547 was shown between the total PDI score and the SF-36. In conclusion, the newly developed Japanese PDI has sufficient reliability and validity to evaluate health-related QOL in Japanese psoriasis patients.

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