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Consistency of “Probable RBD ” Diagnosis with the RBD Screening Questionnaire: A Follow‐up Study
Author(s) -
Stefani Ambra,
Mahlknecht Philipp,
Seppi Klaus,
Nocker Michael,
Mair Katherina J.,
Hotter Anna,
Stockner Heike,
Willeit Johann,
Kiechl Stefan,
Rungger Gregor,
Gasperi Arno,
Poewe Werner,
Högl Birgit
Publication year - 2016
Publication title -
movement disorders clinical practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.754
H-Index - 18
ISSN - 2330-1619
DOI - 10.1002/mdc3.12448
Subject(s) - intraclass correlation , spearman's rank correlation coefficient , medicine , rank correlation , population , cohort , correlation , internal consistency , demography , pediatrics , clinical psychology , statistics , psychometrics , mathematics , environmental health , geometry , sociology
The aim of this study was to evaluate the consistency of “probable RBD ” diagnosis with the RBD screening questionnaire ( RBDSQ ) assessed 2 years apart in a population‐based study. Methods Probable RBD was assessed by RBDSQ in 2008 and in 2010 in the Bruneck Study Cohort, with participants aged ≥60 years. Results A total of 437 participants completed the RBDSQ in 2008 and 2010. There were 29 (6.6%) and 23 (5.3%) participants with probable RBD in 2008 and in 2010, respectively. Only eight (1.8%) screened positive on both occasions. RBDSQ values 2 years apart showed low correlation with each other (Spearman rank coefficient r = 0.348, P < 0.001) and low agreement (intraclass correlation coefficient 0.388, P < 0.001). Conclusions We found low agreement between the two assessments. Possible explanations are the fluctuation of untreated RBD expression and the poor utility of the RBDSQ to detect RBD in the general population. Until further PSG validation of the RBDSQ in population‐based studies, investigators must be aware of the inherent uncertainty of questionnaire‐based RBD diagnosis.