Reliability and validation of the Japanese version of the coma recovery scale-revised (CRS-R)

Brain Inj. 2024 Mar 20;38(4):249-259. doi: 10.1080/02699052.2024.2309549. Epub 2024 Feb 8.

Abstract

Primary objective: This study aimed to verify the reliability and validity of the Japanese version of the Coma Recovery Scale-Revised (CRS-R).

Methods: Subjects included 59 patients with disorders of consciousness (DOC) due to acquired brain injury. To validate test-retest reliability, Evaluator A assessed the CRS-R twice on the same day (A1, A2). To examine inter-rater reliability, Evaluators A (A2) and B (B) assessed the CRS-R without a time interval. To test concurrent validity, Evaluator A (A1) assessed the CRS-R, Japan Coma Scale (JCS), and the Glasgow Coma Scale (GCS) consecutively. To validate diagnostic accuracy, we evaluated the degree of agreement between A1 and A2 and between A2 and B in their diagnosis of DOC by CRS-R.

Results: The test-retest (ρ = 0.92) and inter- (ρ = 0.98) reliability of CRS-R were excellent" and Concurrent validity of CRS-R with JCS (ρ = -0.82) and GCS (ρ = 0.92) were high. Results of DOC diagnosis were consistent for 48/59 cases (κ = 0.82) for A1 and A2 and for 54/59 cases (κ = 0.92) for A2 and B.

Conlcusion: The Japanese version of the CRS-R may be as reliable and valid as the original English and other language versions.

Keywords: Coma recovery scale-revised; disorders of consciousness; emergence from minimally conscious state; minimally conscious state; unresponsive wakefulness syndrome.

Publication types

  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • Brain Injuries*
  • Coma* / diagnosis
  • Coma* / etiology
  • Consciousness Disorders / diagnosis
  • Humans
  • Japan
  • Recovery of Function
  • Reproducibility of Results