title: Evaluation of the psychometric properties of the Persian version of the Pittsburgh Sleep Quality Index in depressed patients.
abstract: BACKGROUND
  The Pittsburgh Sleep Quality Questionnaire is capable of covering different stages of sleep, and it is regarded as one of the best ones available, and checking for its validity and reliability among depressed patients is a step in this direction. The aim of this study was to evaluate the reliability and validity of the Persian version of the Pittsburgh Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS) questionnaires in patients with depression.
  
  
  METHODS
  In this study, 93 depressed patients were in the study group, and 100 patients were in the control group. The Persian translation of the PSQI and ESS questionnaires and the Beck Depression Inventory (BDI) were at the disposal of both validity and reliability of PSQI and ESS, and its correlation with BDI scores were analyzed.
  
  
  RESULTS
  In our study, Cronbach's alpha coefficient of the PSQI questionnaire was 0.821. According to the PSQI and BDI-II scores, the results between the PSQI and ESS scores were significantly correlated.
  
  
  CONCLUSIONS
  Using the Persian PSQI and ESS questionnaires to evaluate sleep quality and daytime sleepiness in patients with depression provides a reliable and valid measure for subjective sleep quality in clinical practice and research.
authors.affiliation: Residence of Psychiatry, Department of Mental Health and Psychiatry, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Shahrzad
authors.initials: S
authors.lastname: Khosravifar
authors.affiliation: MD, Associate Professor of Psychiatry, Sleep Medicine Fellowship, Department of Psychiatry, Mental Health Research Center, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Mirfarhad Ghaleh
authors.initials: MG
authors.lastname: Bandi
authors.affiliation: Department of Mental Health and Psychiatry, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Kaveh
authors.initials: K
authors.lastname: Alavi
authors.affiliation: Residence of Psychiatry, Department of Psychiatry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Pariasadat Haj Seied
authors.initials: PH
authors.lastname: Javadi
keywords: Persian; Pittsburgh Sleep Quality Index (PSQI); depression; psychometric properties
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