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Quality of Life Research
Gepubliceerd in: Quality of Life Research 3/2019

19-11-2018 | Brief Communication

Rasch validation of the Danish version of the shoulder pain and disability index (SPADI) in patients with rotator cuff-related disorders

Auteurs: Karl Bang Christensen, Kristian Thorborg, Per Hölmich, Mikkel Bek Clausen

Gepubliceerd in: Quality of Life Research | Uitgave 3/2019

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Abstract

Purpose

The psychometric properties of the shoulder pain and disability index (SPADI) have been extensively evaluated using classical test theory, but very few studies have applied Rasch analysis. The purpose of this study was to validate the Danish version using Rasch analysis.

Methods

Responses to the SPADI from 229 patients (48% female, mean age 54.5) were included in the Rasch analysis. Overall fit, individual item fit, local response dependence, dimensionality, targeting, reliability, and differential item functioning (DIF) were examined.

Results

After iterative analyses, good fit to the Rasch model was observed, with acceptable targeting and uni-dimensionality. SPADI should be reported as two separate subscales: Pain and Functional Disability. The pain subscale initially demonstrated misfit due to local dependence and DIF, but a log linear Rasch model showed good fit to the Rasch model with acceptable targeting and uni-dimensionality. A six-item version of the disability subscale exhibited adequate fit in the Danish version. The same items were also found to fit the Rasch model in the English version.

Conclusions

The measurement properties of the Danish SPADI are similar to those of the English version. SPADI should be reported as two separate subscales. For the pain subscale, DIF with respect to age was disclosed, but the impact was small. The eight-item disability subscale did not fit the Rasch model. A six-item version of the disability subscale exhibited adequate fit in the Danish version. The same items were also found to fit the Rasch model in the English version.
vorige artikel Psychometric properties of the Quality of Life Inventory-Disability (QI-Disability) measure
volgende artikel A new scale for measuring quality of life in acquired brain injury
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Metagegevens
Titel
Rasch validation of the Danish version of the shoulder pain and disability index (SPADI) in patients with rotator cuff-related disorders
Auteurs
Karl Bang Christensen
Kristian Thorborg
Per Hölmich
Mikkel Bek Clausen
Publicatiedatum
19-11-2018
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 3/2019
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-018-2052-8

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