Japanese version of the Delirium Rating Scale, Revised-98 (DRS-R98-J): reliability and validity.
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.
Kato
Masashi
M
Department of Psychiatry and Behavioral Science, Tokai University School of Medicine, Isehara, Japan.
Kishi
Yasuhiro
Y
Okuyama
Toru
T
Trzepacz
Paula T
PT
Hosaka
Takashi
T
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