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

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• 作者：Julio Fernandez-Mendoza^a ; ^{jfernandezmendoza@hmc.psu.edu} ; Alfredo Rodriguez-Muñ ; oz^b ; Antonio Vela-Bueno^c ; Sara Olavarrieta-Bernardino^c ; Susan L. Calhoun^a ; Edward O. Bixler^a ; Alexandros N. Vgontzas^a
• 关键词：Insomnia Severity Index ; Spanish ; Psychometric properties ; Confirmatory factor analysis ; Validation ; Mood ; Fatigue
• 刊名：Sleep Medicine
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：13
• 期：2
• 页码：207-210
• 全文大小：219 K

文摘

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 ¦Á = 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.