title: The REM sleep behavior disorder screening questionnaire: validation study of a Japanese version.
abstract: BACKGROUND
  REM sleep behavior disorder (RBD) is a parasomnia characterized by intermittent loss of normal skeletal muscle atonia during REM sleep and elaborate motor activity associated with dream mentation. Idiopathic RBD (iRBD) has a known association with neurodegenerative diseases such as synucleinopathies. Recently, a specific screening scale for assessment of REM sleep behavior disorder (RBDSQ) was validated. Detection of RBD using a Japanese version of the RBDSQ would be useful in the stepwise diagnostic process. We investigated the validity and reliability of a Japanese version of this instrument, the RBDSQ-J.
  
  
  METHODS
  Subjects were 52 patients with iRBD diagnosed according to criteria in the International Classification of sleep disorders, second edition, 55 obstructive sleep apnea syndrome (OSAS) patients who responded well to CPAP therapy after a diagnosis of RBD was ruled out by history and polysomnography (PSG) and 65 healthy subjects.
  
  
  RESULTS
  An RBDSQ-J score cut-off of 5.0 was considered useful for differentiating the iRBD group from the healthy subjects or the OSAS group. Cronbach's alpha for the entire RBDSQ-J was 0.866.
  
  
  CONCLUSIONS
  The RBDSQ-J had high sensitivity, specificity, and reliability and would be applicable as a screening method for iRBD in the elderly Japanese population.
authors: Department of Neurology, Center of Sleep Medicine, Dokkyo Medical University School of Medicine, Mibu, Tochigi, Japan. miyamasa@dokkyomed.ac.jp
authors: Tomoyuki
authors: T
authors: Miyamoto
authors: Masayuki
authors: M
authors: Miyamoto
authors: Masaoki
authors: M
authors: Iwanami
authors: Mina
authors: M
authors: Kobayashi
authors: Masaki
authors: M
authors: Nakamura
authors: Yuichi
authors: Y
authors: Inoue
authors: Chiharu
authors: C
authors: Ando
authors: Koichi
authors: K
authors: Hirata
mesh_terms: D000368:Aged; D003431:Cross-Cultural Comparison; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D011594:Psychometrics / Q000706:statistics & numerical data; D020187:REM Sleep Behavior Disorder / Q000175:diagnosis* / Q000453:epidemiology; D012016:Reference Values; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating