| Name of the Instrument/Tool | Insomnia Severity Index (ISI) |
| First Description |
Morin CM. Insomnia: psychological assessment and management. Treatment manuals for practitioners. New York: Guilford Press; 1993 |
| Year | 1991 |
| Domains | |
| Concept of constructs | Sleep |
| Population/Disease | Generic |
| Originally developed for | --- |
| Other rheumatic diseases where can be applied (only if validated) |
Rheumatoid Arthritis (RA), Systemic Lupus Erythematosus (SLE), Osteoarthritis (OA), Fibromyalgia (FM) |
| Additional population with no rheumatic diseases |
Yes PAtients with sleep disorders & cancer |
| Language: Originally published in | English |
| Available in Language | Arabic, German, Italian, French, Korean, Chinese, Spanish |
| REFERENCE IDENTIFICATION | |
| Author/s | Morin CM |
| Title | Insomnia: psychological assessment and management. Treatment manuals for practitioners |
| Journal | New York: Guilford Press |
| Year | 1993 |
| Vol | --- |
| Num | --- |
| Pages | --- |
| Country | Canada |
| Language | English |
| Other references of interest | |
| Link | https://pubmed.ncbi.nlm.nih.gov/11438246/ |
| Brief Description |
Validation of the Insomnia Severity Index as an outcome measure for insomnia research. |
| Link | https://pubmed.ncbi.nlm.nih.gov/22588751/ |
| Brief Description |
Interpreting score differences in the Insomnia Severity Index: using health-related outcomes to define the minimally important difference |
| Link | https://pubmed.ncbi.nlm.nih.gov/33091275/Preliminary validat … |
| Brief Description |
Measures of Sleep in Rheumatologic Diseases: Sleep Quality Patient‐Reported Outcomes in Rheumatologic Diseases |
| Instrument/Tool Translations References | |
| Link | https://pubmed.ncbi.nlm.nih.gov/29260018/ |
| Brief Description |
Reliability, factor analysis and internal consistency calculation of the Insomnia Severity Index (ISI) in French and in English among Lebanese adolescents |
| Link | https://pubmed.ncbi.nlm.nih.gov/27234459/ |
| Brief Description |
Validation study of the Italian version of the Insomnia Severity Index (ISI) |
| Link | https://pubmed.ncbi.nlm.nih.gov/32124114/ |
| Brief Description |
Preliminary validation of the insomnia severity index in Danish outpatients with a medical condition |
| DEVELOPER CONTACT INFORMATION | |
| Correspondence to | Charles M. Morin |
| cmorin@psy.ulaval.ca | |
| Address | 2325, rue des Bibliothèques, Québec, Canada |
| Website | --- |
| Available | --- |
| Links | --- |
| DESCRIPTION OF THE INSTRUMENT | |
| Type Of Measure | Questionnaire |
| Brief Description |
The ISI corresponds with the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) criteria for insomnia. The questions assess 1) sleep onset, 2) sleep maintenance, 3) early awakening, 4) satisfaction with sleep, 5) interference with daytime functioning, 6) noticeability of the sleep problem to others, and 7) distress caused by the sleep problem. ISI measures insomnia symptoms and insomniarelated distress |
| Number of Items | 7 |
| Range | 0-28 |
| Responses options/scale |
Yes Five-point Likert response, with a score of 0 corresponding to “not at all” or “very satisfied” and a score of 4 corresponding to “very much” or “very dissatisfied.” |
| Developed for | Both |
| PRACTICAL APPLICATION | |
| Method of administration | Self-administered |
| Recommendations to score |
The seven response items are summed to calculate a total score. The authors suggest the following categories, defined by a range of scores: no clinically significant insomnia (range of 0-7), subthreshold insomnia (range of 8-14), moderate clinical insomnia (range of 15-21), and severe clinical insomnia (range of 22-28) |
| Score Interpretation | --- |
| Cut-off points | A cutoff score of 10 was optimal for detecting insomnia in a community-based sample (sensitivity: 86.1% & specificity: 87.7%) whereas a cutoff score of 11 was optimal for detecting insomnia in a clinical sample (sensitivity: 97.2% & specificity: 100%) |
| Cut-off points applied to | Both |
| Smallest detectable change if described | --- |
| Smallest detectable change applied to | --- |
| Completion time by the patient | <5 minutes |
| Scoring time by the assessor | <1 minutes |
| Training to score | Not necessary |
| Strengths | Useful in clinical practice & research |
| Limitations | --- |
| OTHER COMMENTS | |
| Other Comments |
The ISI is an excellent tool for assessing insomnia symptoms because its short length, feasibility, and applicability to both healthy and patient populations. For the diagnosis of insomnia, different optimal cutoffs have been determined in different populations and have yet to be validated against updated diagnostic criteria. |