Citation

Okajima I, Nakajima S, Kobayashi M, Inoue Y. Psychiatry Clin. Neurosci. 2013; 67(6): 420-425.

Affiliation

Department of Somnology, Tokyo Medical University, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute, Japan; Yoyogi Sleep Disorder Center, Tokyo, Japan.

Copyright

(Copyright © 2013, John Wiley and Sons)

DOI

10.1111/pcn.12073

PMID

23910517

Abstract

AIM: The aim of this study was to develop and validate a Japanese version of the Athens Insomnia Scale (AIS-J).

METHODS: The AIS-J was created using a back-translation design. A total of 477 outpatients with chronic insomnia and 163 individuals from the general community were recruited. Participants were asked to complete the AIS-J along with two other insomnia scales - Japanese versions of the Pittsburgh Sleep Quality Index and the Insomnia Severity Index.

RESULTS: The AIS-J consisted of a two-factor structure: 'nocturnal sleep problem' (items 1-5) and 'daytime dysfunction' (items 6-8). Internal consistencycoefficients ranged from 0.78 to 0.88. Correlations between the AIS-J and the aforementioned authorized scales were 0.81 and 0.85, respectively. Scores on the AIS-J were significantly higher for the insomnia group than for the control group. The AIS-J cut-off value for identifying pathological insomnia was estimated at 6 points or more, and the AIS-J-nocturnal cut-off value was estimated at 4 points or more.

CONCLUSIONS: The AIS-J has sufficient validity and diagnostic utility.

Language: en