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Rasch Analysis of the Dermatology Life Quality Index Reveals Limited Application to Chinese Patients with Skin Disease
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Guangzhou University of Chinese Medicine Second Affiliated Hospital, China.
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2018 (English)In: Acta Dermato-Venereologica, ISSN 0001-5555, E-ISSN 1651-2057, Vol. 98, no 1, p. 59-64Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to examine the psychometric properties of the Chinese version of the Dermatology Life Quality Index (DLQI) and to assess the invariance of its items with respect to several patient parameters via Rasch analysis. Data were aggregated from 9,845 patients with various skin diseases across 9 hospitals in different regions of China. The response structure, local independence, and reliability of the DLQI scale were analysed in a partial credit model, and differential item functioning (DIF) across region, disease, sex, and age were assessed with a Mantel-Haenszel procedure. Although acceptable scale reliability (Person Separation Index=2.3) was obtained, several problems were revealed, including disordered response thresholds, misfitting items, DIF by geographical region and disease, and mis-targeting patients with mild impairment regarding health-related quality of life (HRQL). In conclusion, the DLQI provides inadequate information on patients' impairments in HRQL, and the application of the DLQI in Chinese patients with skin disease is limited.

Place, publisher, year, edition, pages
Acta Dermato-Venereologica , 2018. Vol. 98, no 1, p. 59-64
Keywords [en]
Dermatology Life Quality Index, skin disease, Chinese, Rasch analysis, differential item functioning
National Category
Dermatology and Venereal Diseases
Identifiers
URN: urn:nbn:se:kth:diva-223288DOI: 10.2340/00015555-2742ISI: 000423836600010PubMedID: 28676885Scopus ID: 2-s2.0-85040829585OAI: oai:DiVA.org:kth-223288DiVA, id: diva2:1183707
Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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He, ZehuiLo Martire, Riccardo
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CiteExportLink to record
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  • apa
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