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The New Delirium Rating Scale (NDRS) makes use of verbal assessments to evaluate the cardinal features of delirium and is an observer-rated, 10-item symptom rating scale based on both DSM-IV and the findings of the previous clinical research. In this study, we tested the validity of the NDRS for measuring the severity of delirium in intensive care units. Thirty consecutive non-intubated patients admitted to the ICU for more than 24 hours were included in the study. Two intensivists were trained to rate delirium according to NDRS and they daily carried out structured interviews to evaluate the patients. All patients were interviewed by a psychiatrist for rating according to NDRS, and the data collected by the psychiatrist and the intensivists were compared. The cut-off score for NDRS was 11.3 patients (10%), who were rated as delirious. The inter-rater reliability of the intensivists and the …