Extensive validation study of the Parkinson's Disease Composite Scale. (31st May 2019)

• Record Type: Journal Article
• Authors: Martinez‐Martin, P.; Radicati, F. G.; Rodriguez Blazquez, C.; Wetmore, J.; Kovacs, N.; Ray Chaudhuri, K.; Stocchi, F.
• Other Names: Vuletic Vladimira investigator.; Falup‐Pecurariu Cristian investigator.; Diaconu Ştefania investigator.; Johansson Anders investigator.; Sundgren Mathias investigator.; Simitsi Athima investigator.; Stefanis Leonidas investigator.; Gurevich Tanya investigator.; Migirov‐Sanderovich Angel investigator.; Ezra Adi investigator.; Guekht Alla investigator.; Popov Georgy investigator.; Stamelou Maria investigator.; Giagkou Nikolaos investigator.; Stefani A. investigator.; Cerroni R. investigator.; Corbo Massimo investigator.; Grassi Andrea investigator.; Dellaporta Dionysia investigator.; Tsolaki Magda investigator.; Ariadne Vakirli investigator.; Kefalopoulou Zinovia investigator.; Ellul John investigator.; Mir Pablo investigator.; Adarmes Astrid D. investigator.; Méndez‐del‐Barrio Carlota investigator.; Skorvanek Matej investigator.; Necpal Jan investigator.; Bostantjopoulou Sevasti investigator.; Zoe Katsarou investigator.; Minar Michal investigator.; Simu Mihaela investigator.; Rosca Cecilia investigator.; Popovici Maria investigator.; Kostić Vladimir S. investigator.; Marti Maria J. investigator.; Planelles Lluis investigator.; Aschermann Zsuzsanna investigator.; Juhász Annamária investigator.; Harmat Márk investigator.;
• Is Part Of: European journal of neurology. Volume 26:Number 10(2019)
• Page Start: 1281
• Page End: 1288
• Publication Date: 2019-05-31
• Subjects: dimensionality -- inter‐rater reliability -- Parkinson's disease -- Parkinson's Disease Composite Scale -- validation; Neurology -- Periodicals; Nervous system -- Diseases -- Periodicals; 616.8
• DOI: 10.1111/ene.13976
• Languages: English
• ISSNs: 1351-5101

Abstract

Abstract : Background and purpose: A composite instrument able to rapidly and reliably assess the most relevant motor and non‐motor afflictions suffered by Parkinson's disease (PD) patients in a real world clinic setting is an unmet need. The recently validated PD Composite Scale (PDCS) was designed to fulfil this gap as a quick, comprehensive PD assessment. The objective of this study was extensive evaluation of the PDCS's clinimetric properties using a large international sample. Methods: This was a cross‐sectional study in which the PDCS, the Movement Disorder Society Unified Parkinson's Disease Rating Scale and the Clinical Impression of Severity Index for PD were applied. Basic clinimetric attributes of the PDCS were analysed. Results: In total, 776 PD patients were included. The PDCS total score showed negligible floor and ceiling effects. Three factors (54.5% of the variance) were identified: factor 1 included motor impairment, fluctuations and disability; factor 2, non‐motor symptoms; and factor 3, tremor and complications of therapy. Cronbach's alpha was from 0.66 to 0.79. Inter‐rater reliability showed weighted kappa values from 0.79 to 0.98 for items and intraclass correlation coefficient values from 0.95 (Disability) to 0.99 (Motor and total score). The Bland–Altmann method, however, showed irregular concordance. PDCS standard error of measurement and convergent validity with equivalent constructs of other measures were satisfactory (≥0.70). PDCS scores significantly differed by Hoehn and Yahr stage. Conclusion: Overall, in line with previous findings, the PDCS is a feasible, acceptable, valid, reliable and precise instrument for quickly and comprehensively assessing PD patients.