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

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...

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Autores principales:	Carmen Rodriguez‐Blazquez, Maria João Forjaz, Alba Ayala, Mari Carmen Portillo, Leire Ambrosio, EC‐PC Validation Group
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	classic test theory living with long‐term condition person‐centred tool psychometric properties Rasch analysis Medicine (General) R5-920 Public aspects of medicine RA1-1270
Acceso en línea:	https://doaj.org/article/21bcde8a6e3d4f9096597a8dd6d27b73
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spelling	oai:doaj.org-article:21bcde8a6e3d4f9096597a8dd6d27b732021-11-29T13:50:52ZLiving with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions1369-76251369-651310.1111/hex.13351https://doaj.org/article/21bcde8a6e3d4f9096597a8dd6d27b732021-12-01T00:00:00Zhttps://doi.org/10.1111/hex.13351https://doaj.org/toc/1369-6513https://doaj.org/toc/1369-7625Abstract 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.Carmen Rodriguez‐BlazquezMaria João ForjazAlba AyalaMari Carmen PortilloLeire AmbrosioEC‐PC Validation GroupWileyarticleclassic test theoryliving withlong‐term conditionperson‐centred toolpsychometric propertiesRasch analysisMedicine (General)R5-920Public aspects of medicineRA1-1270ENHealth Expectations, Vol 24, Iss 6, Pp 2065-2077 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	classic test theory living with long‐term condition person‐centred tool psychometric properties Rasch analysis Medicine (General) R5-920 Public aspects of medicine RA1-1270
spellingShingle	classic test theory living with long‐term condition person‐centred tool psychometric properties Rasch analysis Medicine (General) R5-920 Public aspects of medicine RA1-1270 Carmen Rodriguez‐Blazquez Maria João Forjaz Alba Ayala Mari Carmen Portillo Leire Ambrosio EC‐PC Validation Group Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
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.
format	article
author	Carmen Rodriguez‐Blazquez Maria João Forjaz Alba Ayala Mari Carmen Portillo Leire Ambrosio EC‐PC Validation Group
author_facet	Carmen Rodriguez‐Blazquez Maria João Forjaz Alba Ayala Mari Carmen Portillo Leire Ambrosio EC‐PC Validation Group
author_sort	Carmen Rodriguez‐Blazquez
title	Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
title_short	Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
title_full	Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
title_fullStr	Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
title_full_unstemmed	Living with Chronic Illness Scale: International validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
title_sort	living with chronic illness scale: international validation through the classic test theory and rasch analysis among spanish‐speaking populations with long‐term conditions
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/21bcde8a6e3d4f9096597a8dd6d27b73
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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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