Psychiatry Investig.
2011 Mar;8(1):30-38.
Korean Version of the Delirium Rating Scale-Revised-98: Reliability and Validity
- Affiliations
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- 1Department of Psychiatry, School of Medicine, Kyungpook National University, Daegu, Korea. yanghyun.lee@gmail.com
- 2MAYA Mental Hospital, Yeongcheon, Korea.
- 3Department of Psychiatry, Daegu Veterans Hospital, Daegu, Korea.
- 4Angang Chung-ang Hospital, Gyeongju, Korea.
- 5Department of Medical Statistics, College of Medicine, Catholic University of Daegu, Daegu, Korea.
- 6Department of Psychiatry, College of Medicine, Chungnam National University, Daejeon, Korea.
- 7Lilly Research Laboratories, Neurosciences, Indianapolis, IN, USA.
- 8Department of Psychiatry and Behavioral Sciences, University of Mississippi Medical School, Jackson, MS, USA.
- 9Department of Psychiatry, Tufts University School of Medicine, Boston, MA, USA.
- 10Department of Psychiatry, Indiana University Medical School, Indianapolis, IN, USA.
Abstract
OBJECTIVE
The aims of the present study were 1) to standardize the validity and reliability of the Korean version of Delirium Rating Scale-Revised-98 (DRS-R98-K) and 2) to establish the optimum cut-off value, sensitivity, and specificity for discriminating delirium from other non-delirious psychiatric conditions.
METHODS
Using DSM-IV criteria, 157 subjects (69 delirium, 29 dementia, 32 schizophrenia, and 27 other psychiatric patients) were enrolled. Subjects were evaluated using DRS-R98-K, DRS-K, Mini-Mental State Examination (MMSE-K), and Clinical Global Impression-Severity (CGI-S) scale.
RESULTS
DRS-R98-K total and severity scores showed high correlations with DRS-K. They were significantly different across all groups (p=0.000). However, neither MMSE-K nor CGI-S distinguished delirium from dementia. All DRS-R98-K diagnostic items (#14-16) and items #1 and 2 significantly discriminated delirium from dementia. Cronbach's alpha coefficient revealed high internal consistency for DRS-R98-K total (r=0.91) and severity (r=0.89) scales. Interrater reliability (ICC between 0.96 and 1) was very high. Using receiver operating characteristic analysis, the area under the curve of DRS-R98-K total score was 0.948 between the delirium group and all other groups and 0.873 between the delirium and dementia groups. The best cut-off scores in DRS-R98-K total score were 18.5 and 19.5 between the delirium and the other three groups and 20.5 between the delirium and dementia groups.
CONCLUSION
We demonstrated that DRS-R98-K is a valid and reliable instrument for assessing delirium severity and diagnosis and discriminating delirium from dementia and other psychiatric disorders in Korean patients.
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