Psychometric assessment of subjective sleep quality using the Japanese version of the Pittsburgh Sleep Quality Index (PSQI-J) in psychiatric disordered and control subjects.

By Y. Doi, M. Minowa, M. Uchiyama, M. Okawa, Keiko Kim, K. Shibui, Y. Kamei. Psychiatry Research, 2000

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Psychometric Evaluation of the Chinese Version of the Pittsburgh Sleep Quality Index (CPSQI) in Primary Insomnia and Control Subjects (2005, methodology): “Similar to our study, the diagnosis of primary insomnia was based on the DSM-IV criteria in Backnahs’ and Doi’s studies [11, 21 ].”
The diagnostic validity of the Athens Insomnia Scale. (2003, methodology): “Mary’s Hospital Sleep Questionnaire [4,5], Sleep Problems Scale [6], Pittsburgh Sleep Quality Index [7] and Karolinska Sleep Diary [8,9]), yet only one of them [7] was validated post hoc for its ability to assist clinicians in making the actual diagnosis of insomnia [7,10,11].”
Test-retest reliability and validity of the Pittsburgh Sleep Quality Index in primary insomnia. (2002, methodology): “[4] evaluated the reliability of a Japanese version of the PSQI in a sample of psychiatric patients, which included a small subsample of 14 patients with primary insomnia.”
Reliability and validity of the Persian version of the Pittsburgh Sleep Quality Index (PSQI-P) (2012, methodology): “It was originally designed as a simple and valid instrument for use in diverse clinical conditions [2].”