Publication: 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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2021-11-29
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Wiley
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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.
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Keywords
Classic test theory, Living with, Long-term condition, Person-centred tool, Psychometric properties, Rasch analysis, Spanish
Bibliographic citation
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.