Living with Chronic Illness Scale: international validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
Living with Chronic Illness Scale: international validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions
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.
Rasch analysis, Spanish, classic test theory, living with, long-term condition, person-centred tool, psychometric properties
2065-2077
Rodriguez‐blazquez, Carmen
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Forjaz, Maria João
ba140588-4db3-4dbb-b6d4-53db5e9b9ad4
Ayala, Alba
84333dd6-41fe-4a4e-8f75-c4afda223347
Portillo, Mari Carmen
f913b5c5-b949-48f2-b1d0-eb7505484d5c
Ambrosio, Leire
0a21749c-3817-49de-bf15-0ea9233ecc5c
Rodriguez‐blazquez, Carmen
ab193914-8cd7-4c00-893f-14e14a32152c
Forjaz, Maria João
ba140588-4db3-4dbb-b6d4-53db5e9b9ad4
Ayala, Alba
84333dd6-41fe-4a4e-8f75-c4afda223347
Portillo, Mari Carmen
f913b5c5-b949-48f2-b1d0-eb7505484d5c
Ambrosio, Leire
0a21749c-3817-49de-bf15-0ea9233ecc5c
Rodriguez‐blazquez, Carmen, Forjaz, Maria João, Ayala, Alba, Portillo, Mari Carmen and Ambrosio, Leire
(2021)
Living with Chronic Illness Scale: international validation through the classic test theory and Rasch analysis among Spanish‐speaking populations with long‐term conditions.
Health Expectations, 24 (6), .
(doi:10.1111/hex.13351).
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.
Text
Living with Chronic Illness Scale
- Accepted Manuscript
More information
Accepted/In Press date: 26 July 2021
e-pub ahead of print date: 7 September 2021
Keywords:
Rasch analysis, Spanish, classic test theory, living with, long-term condition, person-centred tool, psychometric properties
Identifiers
Local EPrints ID: 453389
URI: http://eprints.soton.ac.uk/id/eprint/453389
ISSN: 1369-6513
PURE UUID: a64201ba-4323-4041-8dcd-11be99b1e378
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Date deposited: 13 Jan 2022 18:19
Last modified: 17 Mar 2024 03:37
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Contributors
Author:
Carmen Rodriguez‐blazquez
Author:
Maria João Forjaz
Author:
Alba Ayala
Author:
Leire Ambrosio
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