Validation of a 3-factor scoring model for the Pittsburgh sleep quality index in older adults.

TitleValidation of a 3-factor scoring model for the Pittsburgh sleep quality index in older adults.
Publication TypeJournal Article
Year of Publication2006
AuthorsCole JC, Motivala SJ, Buysse DJ, Oxman MN, Levin MJ, Irwin MR
Date Published2006 Jan
KeywordsAged, Factor Analysis, Statistical, Female, Humans, Male, Middle Aged, Reproducibility of Results, Severity of Illness Index, Sleep Wake Disorders, Surveys and Questionnaires

STUDY OBJECTIVES: 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.

DESIGN: 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.

SETTING: San Diego, Denver, and Los Angeles community-based clinics.

PARTICIPANTS: Community-dwelling depressed and nondepressed adults older that 60 years of age (N = 417)

MEASUREMENTS AND RESULTS: 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.

CONCLUSIONS: 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.

Alternate JournalSleep
PubMed ID16453989
Grant ListAG18367 / AG / NIA NIH HHS / United States
MH55253 / MH / NIMH NIH HHS / United States
T32-MH19925 / MH / NIMH NIH HHS / United States