Psychometric evaluation of the German version of the Recovering Quality of Life (ReQoL) measures in patients with affective disorders

Abstract

Background

The generic self-reported Recovering Quality of Life (ReQoL) measures were developed for measuring recovery-focused health-related quality of life (HrQoL) in persons with mental health conditions. The aim of this study was to assess the psychometric properties of the German version of the ReQoL measures in patients with affective disorders in Germany.

Methods

Data from a patient sub-sample in a randomized controlled trial have been used (N = 393). The internal consistency and the test–retest reliability of the ReQoL measures were assessed using Cronbach’s Alpha and the intra-class correlation coefficient (ICC). The concurrent validity and the known-group validity of the ReQoL measures were assessed using Pearson’s Correlation coefficient and Cohen’s d. The responsiveness was assessed using Glass' Δ and the standardized response mean (SRM).

Results

The reliability among the items of the ReQoL-20 was overall excellent. The ICC of the ReQoL-20 was r = 0.70, indicating moderate test–retest reliability. The concurrent validity of the ReQoL-20 with the clinical measure PHQ-9 was strong with a correlation coefficient of r = − 0.76. The known-group validity of the ReQoL-20 using PHQ-9 cut-off points was large with an effect size of d = 1.63. The ReQoL measures were sensitive to treatment response and remission of symptoms measured by the PHQ-9 with large effect sizes/SRM.

Discussion

The psychometric properties of the ReQoL measures for the assessment of patients with affective disorders were overall good. With the ReQoL, valid and reliable measures for the assessment of recovery-focused HrQoL for persons with affective disorders are available in German language.

Metadata

Item Type:	Article
Authors/Creators:	Grochtdreis, T. König, H.-H. Keetharuth, A.D. https://orcid.org/0000-0001-8889-6806 Gallinat, J. Konnopka, A. Schulz, H. Lambert, M. Karow, A. Dams, J.
Copyright, Publisher and Additional Information:	© 2022 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Keywords:	EQ-5D; Germany; Health-related quality of life; Mood disorders; Reliability; Responsiveness; SF6D; Validity
Dates:	Published: June 2023 Published (online): 1 July 2022 Accepted: 7 June 2022
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Health and Related Research (Sheffield) > ScHARR - Sheffield Centre for Health and Related Research
Depositing User:	Symplectic Sheffield
Date Deposited:	13 Jul 2022 07:02
Last Modified:	15 May 2023 15:00
Status:	Published
Publisher:	Springer Nature
Refereed:	Yes
Identification Number:	10.1007/s10198-022-01489-z
Related URLs:	PubMed URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:189012

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Psychometric evaluation of the German version of the Recovering Quality of Life (ReQoL) measures in patients with affective disorders

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