OBJECTIVE: To evaluate whether a 3-factor model of the Pittsburgh Sleep Quality Index (PSQI) scale would fit the constellation of sleep disturbances in patients with a diagnosis of chronic fatigue syndrome (CFS). METHODS: Consecutive CFS patients filled out the PSQI. Scores from this self-report questionnaire were examined with exploratory and confirmatory factor analysis (CFA). RESULTS: 413 CFS patients were included for analysis in this study. CFA showed that the 7 PSQI component scores clustered into the 3 factors reported by Cole et al. (2006), i.e. Sleep Efficiency, Perceived Sleep Quality and Daily Disturbances. In contrast with the single-factor and all 2-factor models, all factor loadings were significant, and all goodness-of-fit values were acceptable. CONCLUSION: In CFS, the PSQI operates as a 3-factor scoring model as initially seen in healthy and depressed older adults. The separation into 3 discrete factors suggests the limited usefulness of the global PSQI as a single factor for the assessment of subjective sleep quality, as also evidenced by a low Cronbach's alpha (0.64) in this patient sample.
OBJECTIVE: To evaluate whether a 3-factor model of the Pittsburgh Sleep Quality Index (PSQI) scale would fit the constellation of sleep disturbances in patients with a diagnosis of chronic fatigue syndrome (CFS). METHODS: Consecutive CFS patients filled out the PSQI. Scores from this self-report questionnaire were examined with exploratory and confirmatory factor analysis (CFA). RESULTS: 413 CFS patients were included for analysis in this study. CFA showed that the 7 PSQI component scores clustered into the 3 factors reported by Cole et al. (2006), i.e. Sleep Efficiency, Perceived Sleep Quality and Daily Disturbances. In contrast with the single-factor and all 2-factor models, all factor loadings were significant, and all goodness-of-fit values were acceptable. CONCLUSION: In CFS, the PSQI operates as a 3-factor scoring model as initially seen in healthy and depressed older adults. The separation into 3 discrete factors suggests the limited usefulness of the global PSQI as a single factor for the assessment of subjective sleep quality, as also evidenced by a low Cronbach's alpha (0.64) in this patient sample.
Authors: Elizabeth Adler; Anand Dhruva; Patricia J Moran; Jennifer Daubenmier; Michael Acree; Elissa S Epel; Peter Bacchetti; Aric A Prather; Ashley Mason; Frederick M Hecht Journal: J Altern Complement Med Date: 2016-12-28 Impact factor: 2.579
Authors: Fidel Hita-Contreras; Emilio Martínez-López; Pedro A Latorre-Román; Francisco Garrido; María A Santos; Antonio Martínez-Amat Journal: Rheumatol Int Date: 2014-02-08 Impact factor: 2.631
Authors: Sara F Milrad; Daniel L Hall; Devika R Jutagir; Emily G Lattie; Gail H Ironson; William Wohlgemuth; Maria Vera Nunez; Lina Garcia; Sara J Czaja; Dolores M Perdomo; Mary Ann Fletcher; Nancy Klimas; Michael H Antoni Journal: J Neuroimmunol Date: 2016-12-14 Impact factor: 3.478