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Development and validation of the J apanese version of the A thens I nsomnia S cale
Author(s) -
Okajima Isa,
Nakajima Shun,
Kobayashi Mina,
Inoue Yuichi
Publication year - 2013
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/pcn.12073
Subject(s) - insomnia , psychology , pathological , chronic insomnia , medicine , sleep disorder , psychiatry
Aim The aim of this study was to develop and validate a J apanese version of the A thens I nsomnia S cale ( 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 – J apanese versions of the P ittsburgh S leep Q uality I ndex and the I nsomnia S everity I ndex. 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.