Psychometric Properties of the Scoliosis Research Society Questionnaire (Version 22r) Domains Among Adults With Spinal Deformity: A Rasch Measurement Theory Analysis

Objective: Adult spinal deformity (ASD) have lower health-related quality of life (HRQoL) compared to the general population. Applying Rasch measurement theory (RMT), this study tested the revised Scoliosis Research Society-22 (SRS-22r) HRQoL instrument among symptomatic adult patients with degenera...

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Veröffentlicht in:Neurospine Jg. 19; H. 2; S. 422 - 433
Hauptverfasser: Kyrölä, Kati, Hiltunen, Susanna, Uimonen, Mikko M., Ylinen, Jari, Häkkinen, Arja, Repo, Jussi P.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Korea (South) Korean Spinal Neurosurgery Society 01.06.2022
대한척추신경외과학회
Schlagworte:
health-related quality of life
latent trait theory
Original
outcomes research
rasch measurement theory
revised scoliosis research society-22
spinal diseases
신경외과학
Health related quality of life
Rasch measurement theory
SRS-22r
Latent trait theory
Outcomes research
Spinal diseases
ISSN:2586-6583, 2586-6591
Online-Zugang:Volltext
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Zusammenfassung:Objective: Adult spinal deformity (ASD) have lower health-related quality of life (HRQoL) compared to the general population. Applying Rasch measurement theory (RMT), this study tested the revised Scoliosis Research Society-22 (SRS-22r) HRQoL instrument among symptomatic adult patients with degenerative spinal disorders and varying degrees of ASD.Methods: SRS-22r data from 637 outpatient spine clinic patients with degenerative spine conditions were investigated for unidimensionality, item/scale fit, differential item functioning (DIF), scale coverage/targeting, and person separation index (PSI) using RMT.Results: Unidimensionality of the SRS-22r was not supported for either the total score or for 3 of its 5 domains. Item fit was acceptable for 11/22 items. The individual domains showed good coverage despite the degree of structural disorders. Ordered thresholds were achieved by merging response categories in some of the items. DIF towards age or sex was found in 11/22 items and in some domain items. The PSI exceeded 0.7 for the SRS-22r total score.Conclusion: The individual domain scores of the SRS-22r perform better than the total score providing good coverage and targeting among patients with ASD. Refinements of items and domains may improve the structural validity of the instrument to meet the criteria for measuring ASD patients, even when multidimensionality persists.
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https://doi.org/10.14245/ns.2143354.677
ISSN:2586-6583
2586-6591
DOI:10.14245/ns.2143354.677