title: Japanese version of the Delirium Rating Scale, Revised-98 (DRS-R98-J): reliability and validity.
abstract: BACKGROUND
  Delirium is a common neuropsychiatric disorder in medical and surgical inpatients of all ages. It is associated with increased long-term mortality, longer length of hospital stay, poor functional recovery, and increased likelihood of nursing home placement.
  
  
  OBJECTIVE
  The aim of this study was to investigate the reliability and the validity of the Japanese translation of the Delirium Rating Scale, Revised-98 (DRS-R-98).
  
  
  METHODS
  Psychiatric-consultation patients were assessed to compare groups of delirium, dementia, and non-delirium.
  
  
  RESULTS
  Mean Total and Severity scores significantly distinguished delirium from the other groups. The scale had high interrater reliability and high internal consistency. Mean Severity scores during delirium differed from the posttreatment scores. Stratum-specific likelihood ratios showed that the DRS-R98-J is a reliable diagnostic tool.
  
  
  CONCLUSIONS
  This study indicates that the Japanese version of the DRS-R-98 has high reliability and validity, and is a useful tool for assessing delirium among Japanese medically ill populations.
authors.affiliation: Department of Psychiatry and Behavioral Science, Tokai University School of Medicine, Isehara, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Kato
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kishi
authors.forename: Toru
authors.initials: T
authors.lastname: Okuyama
authors.forename: Paula T
authors.initials: PT
authors.lastname: Trzepacz
authors.forename: Takashi
authors.initials: T
authors.lastname: Hosaka
mesh_terms: D000368:Aged; D003693:Delirium / Q000175:diagnosis*; D003704:Dementia / Q000175:diagnosis; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D012372:ROC Curve; D015203:Reproducibility of Results