Slater, P., Bunting, B., Hasson, F., Al-Smadi, A. M., Gammoh, O. S., & Ashour, A.
A comparison of an emergent factor structure of the Insomnia Severity Index set against a global context
Study objectives: To identify the factor structure of the Insomnia Severity Index (ISI) and test it against competing international measurement models. Methods: A cross- sectional study survey with a randomly selected sample of 1,500 individuals living in Jordan. The ISI was administered and a response rate of 84% (n = 1,260) obtained. Both exploratory and confirmatory factor analysis were used to examine competing theoretical measurement models. Results: A new emergent measurement model was identified that may help synchronize differing measurement models reported in international literature. Exploratory factor analysis results indicated a two-factor model as a reasonably sound explanation of the data. However, this model is challenged by results from a confirmatory factor analysis. Conclusions: These findings expand the evidence base that the ISI is a reliable instrument to detect severity of insomnia in the population. Our model helps synthesize previous approaches to measurement reported in the international literature.
Testing, Psychometrics, Methodology in Applied Psychology, 2020, Vol. 27, pp. 85-101, DOI: 10.4473/TPM27.1.6
