Insomnia Severity Index.

ISI

What it measures

Perceived severity of insomnia (sleep-onset, maintenance, early-morning waking), satisfaction, daytime interference, noticeability and distress over the past 2 weeks

Length and format

7 items. 5-point Likert (0-4); summed 0-28; 0-7 none, 8-14 subthreshold, 15-21 moderate, 22-28 severe (self-report questionnaire)

Language versions

30+ languages; very broadly validated and translated

Normative data

Normative data for this instrument is held in our reference library. The per-population breakdown is not published here.

Licence

copyrighted - author permission

This instrument is not self-serve. Obtaining it means going to the publisher or the author. We hold no direct link for it; the reference below is the citation to search from.

Licence classification is a research judgement by the catalogue’s authors, not legal advice, and it can be out of date. Confirm terms with the copyright holder or publisher before using an instrument, especially for commercial use.

Reference

Bastien, C. H., Vallieres, A., & Morin, C. M. (2001). Validation of the Insomnia Severity Index. Sleep Medicine, 2(4), 297-307.