title: Utility of the REM sleep behavior disorder screening questionnaire (RBDSQ) in Parkinson's disease patients.
abstract: OBJECTIVE
  We evaluated the usefulness of the REM sleep behavior disorder (RBD) screening questionnaire (RBDSQ) among patients with Parkinson's disease (PD).
  
  
  METHODS
  Forty-five patients with PD were evaluated (22 male and 23 female, 72.9±9.1 years old). After patients completed the RBDSQ, we conducted interviews regarding RBD symptoms and performed polysomnographic examinations on the subjects. We then compared RBDSQ scores among the following groups: PD with RBD (n=19), PD without RBD (n=26), and idiopathic RBD (n=31, 22 male and 9 female, 67.8±6.5 years old), and estimated the cut-off score for an RBD diagnosis.
  
  
  RESULTS
  RBDSQ scores in PD with RBD and idiopathic RBD groups were similar and higher than those in the PD without RBD group (PD with RBD: 7.2±1.9, idiopathic RBD: 7.9±2.8, PD without RBD: 2.9±1.6). Cronbach's α for RBDSQ sub-scores was 0.73, suggesting a fair internal consistency. A receiver-operator characteristics curve revealed that a total score of 6 points on the RBDSQ represented the best cut-off value for detecting RBD (sensitivity=0.842, specificity=0.962).
  
  
  CONCLUSIONS
  RBDSQ could be a useful tool for the screening of RBD in PD patients.
authors.affiliation: Division of Neurology, Department of Brain and Neurosciences, Faculty of Medicine, Tottori University, Japan. ntnomura@med.tottori-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Nomura
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Inoue
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Kagimura
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Uemura
authors.forename: Kenji
authors.initials: K
authors.lastname: Nakashima
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods* / Q000592:standards*; D008875:Middle Aged; D010300:Parkinson Disease / Q000150:complications*; D020187:REM Sleep Behavior Disorder / Q000175:diagnosis* / Q000209:etiology*; D012372:ROC Curve; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*