It Is as It Was: MDS-UPDRS Part III Scores Cannot Be Combined with Other Parts to Give a Valid Sum.
BACKGROUND: Original clinimetric analyses by the Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale (MDS-UPDRS) developers did not confirm the validity of summing the scores of its parts. Recent studies used the summed score of Part III and other parts as efficacy outcomes. OBJECTIVE: The aim of this study was to establish whether summing scores of MDS-UPDRS parts can be recommended. METHODS: Using 7466 full MDS-UPDRS scores, we applied two-step factor analysis as in the original article to reassess the validity analysis with the threshold criterion set at comparative fit index ≥0.9. RESULTS: All comparative fit indexes of any combination including Part III were lower than 0.90. CONCLUSIONS: Summing Part III MDS-UPDRS scores with other parts is not clinimetrically sound. The MDS-UPDRS is a validated four-part scale with corresponding individual part scores and needs to be used within the limits originally presented. © 2022 International Parkinson and Movement Disorder Society.
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Related Subject Headings
- Severity of Illness Index
- Parkinson Disease
- Neurology & Neurosurgery
- Mental Status and Dementia Tests
- Humans
- Factor Analysis, Statistical
- Disability Evaluation
- 3209 Neurosciences
- 3202 Clinical sciences
- 1109 Neurosciences
Citation
Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Severity of Illness Index
- Parkinson Disease
- Neurology & Neurosurgery
- Mental Status and Dementia Tests
- Humans
- Factor Analysis, Statistical
- Disability Evaluation
- 3209 Neurosciences
- 3202 Clinical sciences
- 1109 Neurosciences