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Parkinson’s Disease
Volume 2015, Article ID 982058, 5 pages
http://dx.doi.org/10.1155/2015/982058
Research Article

German Translation and Validation of the “Freezing of Gait Questionnaire” in Patients with Parkinson’s Disease

1Health, Bern University of Applied Sciences, 3008 Bern, Switzerland
2Neurorehabilitation Centre Klinik Bethesda Tschugg, 3233 Tschugg, Switzerland
3Neurology and Neurorehabilitation Centre, Luzerner Kantonsspital, 6000 Luzern, Switzerland
4University of Bern, 3010 Bern, Switzerland

Received 29 November 2014; Accepted 9 January 2015

Academic Editor: Jan O. Aasly

Copyright © 2015 Anina Vogler et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Freezing of Gait (FOG) is a disabling parkinsonian symptom. The Freezing of Gait Questionnaire (FOG-Q) reliably detects FOG in patients with Parkinson’s disease (PD). Objectives. The aim of this study was to develop a German translated version of the FOG-Q and to assess its validity. Methods. The translation was accomplished using forward-backward-translation. The construct validity of the FOG-Q was examined in twenty-seven German native speaking PD patients. Convergent validity was assessed by correlating the FOG-Q with the Movement Disorder Society-Unified Parkinson’s Disease Rating Scale (MDS-UPDRS) II-III, the Parkinson Disease Questionnaire 39 (PDQ-39), and the Timed Up and Go Test (TUG). Divergent validity was assessed by correlating the FOG-Q with the MDS-UPDRS I. The internal consistency was measured using Cronbach’s alpha (Cα). Results. A good internal structure of the FOG-Q was found (). Significant moderate correlations between the FOG-Q and the MDS-UPDRS item 2.13 (freezing) (, ) and between the FOG-Q and the PDQ-39 subscale mobility (, ) were found. The lack of correlation with the MDS-UPDRS I demonstrated good divergent validity. Conclusion. The German FOG-Q is a valid tool to assess FOG in German native speaking PD patients.