Sleep Related Questionnaires

Insomnia Severity Index (ISI)

Name of questionnaire  Insomnia Severity Index (ISI)
Type of questionnaire-description,age Designed to assess the nature, severity, and impact of insomnia and monitor treatment response in adults.
Number of items 7 items
Number of domains/categories N/A
Name of categories/domains   Severity of sleep onset, sleep maintenance and early morning wakening problems, sleep dissatisfaction, interference of sleep difficulties with daytime functioning, noticeability of sleep problems by others, distress caused by the sleep difficulties
Scaling of items 5 point Likert scale (0=no problem, 4=very severe problem)
Scoring available: with permission or free Use with permission
Scoring test-retest reliability Yes
Scoring internal consistency Yes, Cronbach α = 0.90 and 0.91
Validity Yes, face and content validity; correlated with sleep diaries, polysomnography, and interviews; cutoff score of 10 had a 86.1% sensitivity and 87.7% specificity for detecting insomnia cases in the community sample.
Available forms (short and/or long etc.) N/A
Language English
Translations in other languages (if yes, then list the languages) Spanish, French, Arabic, Hindi, German, Korean, Chinese, Iranian, Italian
Developer name Charles Morin, PhD, et al
Developer contact information for permission

Charles M. Morin, PhD, Université Laval, 2325, rue des Bibliothèques,
École de Psychologie, Pavillon F.A.S., Quebec, QC G1V 0A6, Canada.
Tel: (418) 656-3275; Fax: (418) 656-5152;
E-mail: cmorin@psy.ulaval.ca 

Availability of questionnaire: needs permission from developer, cost or freely available  Use with permission
Limitations Limited ability to differentiate primary insomnia from insomnia with comorbid psychiatric or other medical disease
Link to the questionnaire (if available) Click Here to View Questionaire
Other comments  
Patient populations in who questionnaire has been validated Spanish, French, Arabic, Hindi, German, Korean, Chinese, Iranian, Italian
References (including original publication, validity and reliability in different countries/languages, populations and long/short versions)

1. Morin CM, Insomnia, psychological assessment and management. Guilford Press, New York, 1993
2. Bastein CH, et al. Validation of the Insomnia Severity Index as an outcome measure for insomnia research.  Sleep Medicine.  2001; 2 (4): 297 – 307
3. 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
4. Fernandez-Mendoza,J. et al. The Spanish version of the Insomnia Severity Index: A confirmatory factor analysis. Sleep Medicine. 2011; 13(2):207-210
5. Suleiman K, et al. Translating the Insomnia Severity Index Into Arabic.  J. Nursing Scholarship 2011; 43(1):49-53
6. Lahan V, et al. Translation and Validation of the Insomnia Severity Index in Hindi Language Indian J Psychol Med. 2011, 33(2): 172–176.
7. Yazdi Z, et al. Validity and Reliability of the Iranian Version of the Insomnia Severity Index. The Malaysian Journal of Medical Sciences: MJMS. 2012; 19(4):31-36.
8. S. Badiee Aval Baghyahi et al.  Reliability and validity of the chinese translation of insomnia severity index (C-ISI) in chinese patients with insomnia. European Psychiatry. 2013, 28(1).
9. Gerber M, et al. Validation of the German version of the insomnia severity index in adolescents, young adults and adult workers: results from three cross-sectional studies. BMC Psychiatry. 2016;16: 174
10. Yong Won Cho, et al. Validation of a Korean Version of the Insomnia Severity Index. Journal of Clinical Neurology (Seoul, Korea). 2014;10 (3):210-215.
11. Cagnon C, et al. Validation of the Insomnia Severity Index in Primary Care. J Am Board Fam Med November-December 2013; 26 (6): 701-710
12.  Castronovo V, et al, Validation study of the Italian version of the Insomnia Severity Index (ISI).  Neurol Sci. 2016; 37(9):1517-24.

Updated by  Rosemarie Beckford, MD
The last date of update  December 2016