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. 2020 Sep 15;20(1):346.
doi: 10.1186/s12883-020-01926-7.

Rasch analysis of the living with chronic illness scale in Parkinson's disease

Leire Ambrosio  1 , Carmen Rodriguez-Blazquez  2 , Alba Ayala  3 , Maria João Forjaz  3
Affiliations

Rasch analysis of the living with chronic illness scale in Parkinson's disease

Leire Ambrosio et al. BMC Neurol. .

Abstract

Background: Neurologists play an essential role in facilitating the patient's process of living with Parkinson's disease (PD). The Living with Chronic Illness Scale-PD (LW-CI-PD) is a unique available clinical tool that evaluates how the patient is living with PD. The objective of the study was to analyse the LW-CI-PD properties according to the Rasch model.

Methods: An open, international, cross-sectional study was carried out in 324 patients with Parkinson's disease from four Latin American countries and Spain. Psychometric properties of the LW-CI-PD were tested using Rasch analysis: fit to the Rasch model, item local independency, unidimensionality, reliability, and differential item functioning by age and gender.

Results: Original LW-CI-PD do not fit Rasch model. Modifications emerged included simplifying the response scale and deleting misfit items, the dimensions Acceptance, Coping and Integration showed a satisfactory fit to the Rasch model, with reliability indices greater than 0.70. The dimensions Self-management and Adjustment to the disease did not reach fit to the Rasch model.

Conclusion: Suggestions for improving the LW-CI-PD include a multidimensional and shorter scale with 12 items grouped in three subscales with a simpler response scheme. The final LW-CI-PD Scale version is a reliable scale, with good internal construct validity, that provides Rasch transformed results on linear metric scale.

Keywords: LW-CI-PD; Living with; Parkinson’s disease; Psychometrics; Rasch analysis.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Person-item distribution for dimensions Acceptance (top), Coping (middle) and Integration (bottom) dimensions, after model modifications
See this image and copyright information in PMC

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