The Spanish version of the Insomnia Severity Index: A confirmatory factor analysis

Julio Fernandez-Mendoza, Alfredo Rodriguez-Muñoz, Antonio Vela-Bueno, Sara Olavarrieta-Bernardino, Susan Calhoun, Edward Bixler, Alexandros Vgontzas

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Objective: To examine the psychometric properties of the Spanish version of the Insomnia Severity Index (ISI) and to determine its factor structure with confirmatory factor analysis (CFA). Methods: Self-reported information was collected from a sample of 500 adults (mean age 39.13 [standard deviation 15.85]. years) drawn from a population of medical students and their social networks. Together with the ISI, a measure of the subjective severity of insomnia, subjects completed the Pittsburg Sleep Quality Index, the Epworth Sleepiness Scale, and the Profile of Mood States to study concurrent validity of the ISI. CFA was used to test alternative models to ascertain the factorial structure of the ISI. Results: The Spanish version of the ISI showed adequate indices of internal consistency (Cronbach's α= 0.82). CFA showed that a three-factor structure provided a better fit to the data than one-factor and two-factor structures. The ISI was significantly correlated with poor sleep quality, fatigue, anxiety, and depression, and discriminated between good and poor sleepers. Conclusions: The ISI is a reliable and valid instrument to assess the subjective severity of insomnia in Spanish-speaking populations. Its three-factor structure (i.e., night-time sleep difficulties, sleep dissatisfaction and daytime impact of insomnia) makes it a psychometrically robust and clinically useful measure.

Original languageEnglish (US)
Pages (from-to)207-210
Number of pages4
JournalSleep Medicine
Volume13
Issue number2
DOIs
StatePublished - Feb 1 2012

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Sleep Initiation and Maintenance Disorders
Statistical Factor Analysis
Sleep
Medical Students
Psychometrics
Social Support
Population
Fatigue
Cohort Studies
Anxiety
Depression

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Fernandez-Mendoza, Julio ; Rodriguez-Muñoz, Alfredo ; Vela-Bueno, Antonio ; Olavarrieta-Bernardino, Sara ; Calhoun, Susan ; Bixler, Edward ; Vgontzas, Alexandros. / The Spanish version of the Insomnia Severity Index : A confirmatory factor analysis. In: Sleep Medicine. 2012 ; Vol. 13, No. 2. pp. 207-210.
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The Spanish version of the Insomnia Severity Index : A confirmatory factor analysis. / Fernandez-Mendoza, Julio; Rodriguez-Muñoz, Alfredo; Vela-Bueno, Antonio; Olavarrieta-Bernardino, Sara; Calhoun, Susan; Bixler, Edward; Vgontzas, Alexandros.

In: Sleep Medicine, Vol. 13, No. 2, 01.02.2012, p. 207-210.

Research output: Contribution to journalArticle

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