Articlegreen2012

Confirmatory Factor Analysis of the Pittsburgh Sleep Quality Index in Rheumatoid Arthritis Patients

Perry M. Nicassio · Sarah R. Ormseth · Mara K. Custodio · Michael H. Weisman · Michael R. Irwin

103 citations0/0 files storedBehavioral Sleep Medicine

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Abstract

The purpose of this research was to evaluate the factor structure of the Pittsburgh Sleep Quality Index (PSQI) in rheumatoid arthritis (RA). The sample included 107 patients with RA, 88 females and seven males, with an average age of 56.09 years, recruited from the greater Southern California area. Confirmatory factor analysis evaluated single, two- and three-factor models. The single factor solution yielded a poor fit to the data. While the three-factor solution had the best fit, the two-factor solution, comprised of sleep efficiency and perceived sleep quality factors, was optimal because it had very good fit, and acceptable reliability for its individual factors. Clinical indices were consistently correlated with the sleep quality factor, but not with the sleep efficiency factor.

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References

1977The CES-D Scale 1998Principles and Practice of Structural Equation Modeling 1989The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research 1992The MOS 36-item short-form health survey (SF-36). I. Conceptual framework and item selection.1992The MOS 36-ltem Short-Form Health Survey (SF-36)1992Alternative Ways of Assessing Model Fit 1994Testing Structural Equation Models.1993The handbook of psychological testing

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