Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish-speaking populations with long-term conditions

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dc.contributor.author Rodríguez Blázquez, Carmen
dc.contributor.author Forjaz, Maria João
dc.contributor.author Ayala Garcia, Alba
dc.contributor.author Portillo, Mari Carmen
dc.contributor.author Ambrosio, Leire
dc.date.accessioned 2022-05-10T10:21:19Z
dc.date.available 2022-05-10T10:21:19Z
dc.date.issued 2021-11-29
dc.identifier.bibliographicCitation Rodriguez‐Blazquez, C., Forjaz, M. J., Ayala, A., Portillo, M. C., & Ambrosio, L. (2021). Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions. In Health Expectations (Vol. 24, Issue 6, pp. 2065–2077). Wiley.
dc.identifier.issn 1369-6513
dc.identifier.uri http://hdl.handle.net/10016/34754
dc.description.abstract Background: The Living with Chronic Illness (LW-CI) Scale is a comprehensive patient-reported outcome measure that evaluates the complex process of living with long-term conditions. Objective: This study aimed to analyse the psychometric properties of the LW-CI scale according to the classic test theory and the Rasch model among individuals living with different long-term conditions. Design: This was an observational, international and cross-sectional study. Methods: A total of 2753 people from six Spanish-speaking countries living with type 2 diabetes mellitus, chronic obstructive pulmonary disease, chronic heart failure, Parkinson's disease, hypertension and osteoarthritis were included. The acceptability, internal consistency and validity of the LW-CI scale were analysed using the classical test theory, and fit to the model, unidimensionality, person separation index, item local independency and differential item functioning were analysed using the Rasch model. Results: Cronbach's α for the LW-CI scale was .91, and correlation values for all domains of the LW-CI scale ranged from .62 to .68, except for Domain 1, which showed correlation coefficients less than .30. The LW-CI domains showed a good fit to the Rasch model, with unidimensionality, item local independency and moderate reliability providing scores in a true interval scale. Except for two items, the LW‐CI scale was free from bias by long-term condition type. Discussion: After some adjustments, the LW-CI scale is a reliable and valid measure showing a good fit to the Rasch model and is ready for use in research and clinical practice. Future implementation studies are suggested. Patient and Public Contribution: Patient and public involvement was conducted before this validation study - in the pilot study phase.
dc.description.sponsorship The authors would like to thank the Ministry of Science, Innovation and University of the Spanish Government for the financial support in the development of this project. Besides, the authors would like to acknowledge the collaboration of people living with long-term conditions who participated in this project. The secretary, administrative staff, nurses, physicians and other healthcare staff who helped during the data collection process are also acknowledged. Finally, the authors would like to acknowledge each member of the EC-PC validation group (Supporting Information Appendix) for their outstanding contribution in the different stages and phases of this macro and international project. This study was financially supported in Spain by the Ministry of Science, Innovation and University of the Spanish Government (FEDER/Ministerio de Ciencia, Innovación y Universidades—Agencia Estatal de Investigación/Proyecto [CSO2017–82691-R]).
dc.format.extent 12
dc.language.iso eng
dc.publisher Wiley
dc.rights © 2021 The Authors.
dc.rights Atribución 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by/3.0/es/
dc.subject.other Classic test theory
dc.subject.other Living with
dc.subject.other Long-term condition
dc.subject.other Person-centred tool
dc.subject.other Psychometric properties
dc.subject.other Rasch analysis
dc.subject.other Spanish
dc.title Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish-speaking populations with long-term conditions
dc.type article
dc.subject.eciencia Biología y Biomedicina
dc.identifier.doi https://doi.org/10.1111/hex.13351
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. CSO2017–82691-R
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 2065
dc.identifier.publicationissue 6
dc.identifier.publicationlastpage 2077
dc.identifier.publicationtitle HEALTH EXPECTATIONS
dc.identifier.publicationvolume 24
dc.identifier.uxxi AR/0000030519
dc.contributor.funder Ministerio de Ciencia, Innovación y Universidades (España)
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