Psychometric evaluation of the Pittsburgh sleep quality index in cancer patients

Susan L. Beck, Anna L. Schwartz, Gail Towsley, William Dudley, Andrea Barsevick

Research output: Contribution to journalArticlepeer-review

327 Scopus citations


This report summarizes findings related to the psychometric properties (internal consistency and construct validity) of the Pittsburgh Sleep Quality Index (PSQI) and discusses issues related to its use based on data from two clinical studies with diverse samples of cancer patients. Subjects completed a questionnaire that included the PSQI, the Schwartz Cancer Fatigue Scale, and specific demographic, disease, and treatment variables. There were complete data on 170 (of 214) cases in Study 1 and 249 (of 259) cases in Study 2. The Cronbach's alpha for the Global Sleep Quality scale was 0.81 in Study 1 and 0. 77 in Study 2. A comparison of Global Sleep Quality in two contrasting groups with low and high fatigue yielded statistically significant differences in both samples. Psychometric evaluation supports its internal consistency reliability and construct validity. However, the scoring is rather cumbersome and raises questions regarding level of measurement and appropriate analysis techniques.

Original languageEnglish (US)
Pages (from-to)140-148
Number of pages9
JournalJournal of Pain and Symptom Management
Issue number2
StatePublished - Feb 2004
Externally publishedYes


  • Cancer
  • Insomnia
  • Measurement
  • Medical oncology
  • Neoplasm
  • Psychometrics
  • Sleep

ASJC Scopus subject areas

  • General Nursing
  • Clinical Neurology
  • Anesthesiology and Pain Medicine


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