Vol 55, No 2 (2021)
Research Paper
Published online: 2021-02-02

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Validation of the Polish version of the Unified Dyskinesia Rating Scale (UDysRS)

Joanna Siuda1, Magdalena Boczarska-Jedynak2, Sławomir Budrewicz3, Jarosław Dulski45, Monika Figura6, Urszula Fiszer7, Agata Gajos8, Agnieszka Gorzkowska9, Ewa Koziorowska-Gawron3, Dariusz Koziorowski6, Anna Krygowska-Wajs10, Monika Rudzińska-Bar11, Jarosław Sławek45, Mateusz Toś1, Magdalena Wójcik-Pędziwiatr11, Jeffrey Lin12, Sheng Luo13, Pablo Martinez-Martin14, Glenn T. Stebbins15, Christopher G. Goetz15, Grzegorz Opala1, Polish UDysRS Validation Task Force
Pubmed: 33528833
Neurol Neurochir Pol 2021;55(2):186-194.


Background. In 2008, the Movement Disorders Society published the Unified Dyskinesia Rating Scale (UDysRS). This has become the established tool for assessing the severity and disability associated with dyskinesia in patients with Parkinson’s Disease (PD). We translated and validated the Polish version of the UDysRS, explored its dimensionality, and compared it to the Spanish version, which is the Reference Standard for UDysRS translations. Material and methods. The UDysRS was translated into Polish by a team led by JS and GO. The back-translation, completed by colleagues fluent in both Polish and English who were not involved in the original translation, was reviewed and approved by the Executive Committee of the MDS Rating Scales Programme. Then the translated version of the UDysRS underwent cognitive pretesting, and the translation was modified based on the results. The approved version was considered to be the Official Working Document of the Polish UDysRS and was tested on 250 Polish PD patients recruited at movement disorder centres. Data was compared to the Reference Standard used for validating UDysRS translations.

Results. The overall factor structure of the Polish version was consistent with that of the Reference Standard version, as evidenced by the high Confirmatory Fit Index score (CFI = 0.98). The Polish UDysRS was thus confirmed to share a common factor structure with the Reference Standard. Conclusions. The Official Polish UDysRS translation is recommended for use in clinical and research settings. Worldwide use of uniform rating measures offers a common ground to study similarities and differences in disease manifestations and progression across cultures.


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