Test-retest reliability and validity of the Pittsburgh Sleep Quality Index in primary insomnia

Jutta Backhaus*, Klaus Junghanns, Andreas Broocks, Dieter Riemann, Fritz Hohagen

*Corresponding author for this work
858 Citations (Scopus)


Objective: Psychometric evaluation of the Pittsburgh Sleep Quality Index (PSQI) for primary insomnia. Methods: The study sample consisted of 80 patients with primary insomnia (DSM-IV). The length of the test-retest interval was either 2 days or several weeks. Validity analyses were calculated for PSQI data and data from sleep diaries, as well as polysomnography. To evaluate the specificity of the PSQI, insomnia patients were compared with a control group of 45 healthy subjects. Results: In primary insomnia patients, the overall PSQI global score correlation coefficient for test-retest reliability was .87. Validity analyses showed high correlations between PSQI and sleep log data and lower correlations with polysomnography data. A PSQI global score > 5 resulted in a sensitivity of 98.7 and specificity of 84.8 as a marker for sleep disturbances in insomnia patients versus controls. Conclusion: The PSQI has a high test-retest reliability and a good validity for patients with primary insomnia.

Original languageEnglish
JournalJournal of Psychosomatic Research
Issue number3
Pages (from-to)737-740
Number of pages4
Publication statusPublished - 01.09.2002

Research Areas and Centers

  • Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)


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