Validation of a 3-Factor scoring model for the Pittsburgh Sleep Quality Index in Older Adults

University of Pittsburgh, Pittsburgh, Pennsylvania, United States
Sleep (Impact Factor: 4.59). 02/2006; 29(1):112-6.
Source: PubMed


The Pittsburgh Sleep Quality Index (PSQI) is widely used to assess subjective sleep disturbances in psychiatric, medical, and healthy adult and older adult populations. Yet, validation of the PSQI single-factor scoring has not been carried out.
The PSQI was administered as a self-report questionnaire. Using a cross-validation approach, scores from the PSQI were analyzed with exploratory and confirmatory factor analyses.
San Diego, Denver, and Los Angeles community-based clinics.
Community-dwelling depressed and nondepressed adults older that 60 years of age (N = 417)
Results yielded a 3-factor scoring model that obtained a measure of perfect fit and was significantly better fitted than either the original single-factor model or a 2-factor model. Components of the 3 factors were characterized by the descriptors sleep efficiency, perceived sleep quality, and daily disturbances.
These findings validate the factor structure of the PSQI and demonstrate that a 3-factor score should be used to assess disturbances in three separate factors of subjective sleep reports.

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Available from: Michael R Irwin, Mar 16, 2014
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    • "Higher PSQI values thereby indicate worse sleep quality. To address the study aim concerning potential sleep dimension-specific effects on cortisol stress responses, subscales aligning with components identified by Cole et al. (2006) as a result of a principal component analysis of the PSQI were assessed (Cole et al., 2006). These include ''average hours of sleep'' (During the past month, how many hours of actual sleep did you get at night?), ''sleep quality'' (During the past month, how would you rate your sleep quality overall?) and ''daytime dysfunction'' (During the past month, how often have you had trouble staying awake while driving, eating meals, or engaging in social activity; During the past month, how much of a problem has it been for you to keep up enough enthusiasm to get things done?). "
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