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Insomnia severity index (ISI)

JP Jangho Park
SC Seockhoon Chung
JL Jiho Lee
JS Joo Hyun Sung
SC Seung Woo Cho
CS Chang Sun Sim
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The ISI—a brief self-administered measure of insomnia—was used to evaluate perceived sleep difficulties. The ISI comprises 7 items: each item is rated on a scale of 0–4, and the total scores range from 0 to 28. A higher score suggests more severe insomnia. The items include perceived severity of sleep onset and maintenance problems, early morning awakening, and the level of distress caused by these problems. Scores may be categorized as 0–7 (no clinically significant insomnia) or 8–28 (some degree of insomnia) [20].

Copyright and License information: The Author(s). ©2017
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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