Reliability, factor analysis and internal consistency calculation of the Insomnia Severity Index (ISI) in French and in English among Lebanese adolescents
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OBJECTIVES: Our goal is to validate and to verify the reliability of the French and English versions of the Insomnia Severity Index (ISI) in Lebanese adolescents. STUDY DESIGN: A cross-sectional study was implemented. METHODS: 104 Lebanese students aged between 14 and 19 years participated in the study. The English version of the questionnaire was distributed to English-speaking students and the French version was administered to French-speaking students. A scale (1 to 7 with 1 = very well understood and 7 = not at all) was used to identify the level of the students' understanding of each instruction, question and answer of the ISI. The scale's structural validity was assessed. The factor structure of ISI was evaluated by principal component analysis. The internal consistency of this scale was evaluated by Cronbach's alpha. To assess test-retest reliability the intraclass correlation coefficient (ICC) was used. RESULTS: The principal component analysis confirmed the presence of a two-component factor structure in the English version and a three-component factor structure in the French version with eigenvalues > 1. The English version of the ISI had an excellent internal consistency (α = 0.90), while the French version had a good internal consistency (α = 0.70). The ICC presented an excellent agreement in the French version (ICC = 0.914, CI = 0.856-0.949) and a good agreement in the English one (ICC = 0.762, CI = 0.481-890). The Bland-Altman plots of the two versions of the ISI showed that the responses over two weeks' were comparable and very few outliers were detected. CONCLUSION: The results of our analyses reveal that both English and French versions of the ISI scale have good internal consistency and are reproducible and reliable. Therefore, it can be used to assess the prevalence of insomnia in Lebanese adolescents.
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The Insomnia Severity Index has been validated in adolescent samples.
“The ISI was designed for use in adults but has been widely administered to, and validated in, adolescent samples.25–27”
From Pilot evaluation of the Sleep Ninja: A smartphone application for adolescent insomnia symptoms (2019) · cites this paper as [26]
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References 39 · Cited by 64
Research works printed but not linked: 3
- [29]The World Bank Lebanon Quarterly Update, First Quarter 2006 2006 The World Bank Beirut (PDF)
- [40]Nunnally J.C. Bernstein I. Psychometric Theory third ed. 1994 McGraw-Hill New York 275 280 (J. Psychoeduc. Assess. 1999, 17)
- [42]Sierra J.C. Guillén-Serrano V. Santos-Iglesias P. Insomnia Severity Index: some indicators about its reliability and validity on an older adults sample Rev. Neurol. 47 11 2008 1–15 566 570 19048535
- Authors
- Chahoud, M., Chahine, R., Salameh, P., & Sauleau, E. A.
- Affiliations
- Lebanese University (LB)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Chahoud, M.
- Venue
- eNeurologicalSci
- Publisher
- Elsevier BV
- Published
- 2017-06
- Volume
- 7
- Pages
- 9-14
- ISSN
- 2405-6502 (ISSN-L)
- PMC
- PMC5721555
- OpenAlex
- W2596191520
- Cited by
- 64
- References
- 39
- Citations by year
- 2026: 2 · 2025: 6 · 2024: 11 · 2023: 10 · 2022: 5 · 2021: 6 · 2020: 9 · 2019: 8 · 2018: 6 · 2017: 1
- FWCI
- 8.55
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- eNeurologicalSci (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Université Libanaise
- Fakultet Medicinskih Nauka, Univerziteta U Kragujevcu
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Social Sciences › Decision Sciences › Management Science and Operations Research › Psychometric Methodologies and Testing
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
- Keywords
- Insomnia Severity Index, insomnia, adolescents, Lebanese adolescents, French adaptation, English version, cross-cultural adaptation, psychometric validation, factor structure, internal consistency, test-retest reliability, questionnaire comprehensibility
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