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Common measure of quality of life for people with systemic sclerosis across seven European countries: A cross-sectional study

Ndosi, Mwidimi; Alcacer-Pitarch, Begonya; Allanore, Yannick; Del galdo, Francesco; Frerix, Mark; Garcia-Diaz, Silvia; Hesselstrand, Roger; Kendall, C; Maticci-Cerinic, Marco; Mueller-Ladner, Ulf; Sandqvist, Gunnel; Torrente-Segarra, V; Schmeiser, T; Sierakowska, Matylda; Sierakowska, Jusyna; Sierakowski, Stan; Redmond, Anthony

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Authors

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Dr Mwidimi Ndosi Mwidimi.Ndosi@uwe.ac.uk
Associate Professor in Nursing Rheumatology

Begonya Alcacer-Pitarch

Yannick Allanore

Francesco Del galdo

Mark Frerix

Silvia Garcia-Diaz

Roger Hesselstrand

C Kendall

Marco Maticci-Cerinic

Ulf Mueller-Ladner

Gunnel Sandqvist

V Torrente-Segarra

T Schmeiser

Matylda Sierakowska

Jusyna Sierakowska

Stan Sierakowski

Anthony Redmond



Abstract

© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved.

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.

Citation

Ndosi, M., Alcacer-Pitarch, B., Allanore, Y., Del galdo, F., Frerix, M., Garcia-Diaz, S., …Redmond, A. (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), 1032-1038. https://doi.org/10.1136/annrheumdis-2017-212412

Journal Article Type Article
Acceptance Date Jan 30, 2018
Online Publication Date Feb 20, 2018
Publication Date Jul 1, 2018
Deposit Date Feb 2, 2018
Publicly Available Date Mar 29, 2024
Journal Annals of the Rheumatic Diseases
Print ISSN 0003-4967
Electronic ISSN 1468-2060
Publisher BMJ Publishing Group
Peer Reviewed Peer Reviewed
Volume 77
Issue 7
Pages 1032-1038
DOI https://doi.org/10.1136/annrheumdis-2017-212412
Keywords systemic sclerosis, quality of life, outcomes research, patient perspective, health services research
Public URL https://uwe-repository.worktribe.com/output/875340
Publisher URL http://dx.doi.org/10.1136/annrheumdis-2017-212412