Insomnia Severity Index (ISI)
Clinical intent
The Insomnia Severity Index (ISI) is a brief instrument that was designed to assess the severity of both nighttime and daytime components of insomnia.
It is is a 7-item self-report questionnaire assessing the nature, severity, and impact of insomnia. The usual recall period is the “last month” and the dimensions evaluated are: severity of sleep onset, sleep maintenance, and early morning awakening problems, sleep dissatisfaction, interference of sleep difficulties with daytime functioning, noticeability of sleep problems by others, and distress caused by the sleep difficulties.
Clinical interpretation
| Score | Interpretation |
|---|---|
| 0-7 | No clinically significant insomnia |
| 8-14 | Subthreshold insomnia |
| 15-21 | Clinical insomnia (moderate severity) |
| 22-28 | Clinical insomnia (severe) |
References
[1] Morin CM, Belleville G, Bélanger L, Ivers H. The Insomnia Severity Index: psychometric indicators to detect insomnia cases and evaluate treatment response. Sleep. 2011;34(5):601-608. Published 2011 May 1. doi:10.1093/sleep/34.5.601
Pathway
Form preview
Interactive preview of the questionnaire. Not for clinical use. Responses are not stored.