Ndosi, M orcid.org/0000-0002-7764-3173, Alcacer-Pitarch, B, Allanore, Y et al. (14 more authors) (2018) Common measure of quality of life for people with systemic sclerosis across seven European countries: a cross-sectional study. Annals of the Rheumatic Diseases, 77 (7). pp. 1032-1038. ISSN 0003-4967
Abstract
Objectives: The aim of this study was to adapt the Systemic Sclerosis Quality of Life Questionnaire (SScQoL) into six European cultures and validate it as a common measure of quality of life in systemic sclerosis (SSc). Methods: This was a seven-country (Germany, France, Italy, Poland, Spain, Sweden and UK) cross-sectional study. A forward–backward translation process was used to adapt the English SScQoL into target languages. SScQoL was completed by patients with SSc, then data were validated against the Rasch model. To correct local response dependency, items were grouped into the following subscales: function, emotion, sleep, social and pain and reanalysed for fit to the model, unidimensionality and cross-cultural equivalence. Results: The adaptation of the SScQoL was seamless in all countries except Germany. Cross-cultural validation included 1080 patients with a mean age 58.0 years (SD 13.9) and 87% were women. Local dependency was evident in individual country data. Grouping items into testlets corrected the local dependency in most country specific data. Fit to the model, reliability and unidimensionality was achieved in six-country data after cross-cultural adjustment for Italy in the social subscale. The SScQoL was then calibrated into an interval level scale. Conclusion: The individual SScQoL items have translated well into five languages and overall, the scale maintained its construct validity, working well as a five-subscale questionnaire. Measures of quality of life in SSc can be directly compared across five countries (France, Poland Spain, Sweden and UK). Data from Italy are also comparable with the other five countries although require an adjustment.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted. This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/ |
Keywords: | health services research; outcomes research; patient perspective; quality of life; systemic sclerosis |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Healthcare (Leeds) > Nursing Adult (Leeds) The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Medicine (Leeds) > Institute of Rheumatology & Musculoskeletal Medicine (LIRMM) (Leeds) > Clinical Musculoskeletal Medicine (LIRMM) (Leeds) |
Funding Information: | Funder Grant number NCCRCD National Co-ordinating Centre for Research Capacity Development CATCRDF09/47 BEGONYA European League Against Rheumatism NONE GIVEN NIHR National Inst Health Research NF-SI-0616-10108 |
Depositing User: | Symplectic Publications |
Date Deposited: | 28 Feb 2018 12:01 |
Last Modified: | 25 Jun 2023 21:15 |
Status: | Published |
Publisher: | BMJ Publishing Group |
Identification Number: | 10.1136/annrheumdis-2017-212412 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:127950 |