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

By J. Backhaus, K. Junghanns, A. Broocks, Dieter Riemann, F. Hohagen. Journal of Psychosomatic Research, 2002

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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): “... the psychometric properties of the PSQI and reported acceptable internal consistency [10], test–retest reliability [11], construct validity [10], and criterion-related validity [11] in several clinical populations including bone marrow transplant patients (n ¼ 155), renal transplant patients (n ”
Reliability and validity of the Persian version of the Pittsburgh Sleep Quality Index (PSQI-P) (2012, background): “Its reliability and validity have been demonstrated for patients with psychiatric and sleep disorders and for patients with other somatic diseases [5–8].”
The reliability and validity of the Korean version of the Pittsburgh Sleep Quality Index (2012, background): “Post hoc analysis with the seven component scores of the PSQI-K in each sleep disorder group showed there were differences between subjects with primary insomnia, narcolepsy, and the healthy controls, which is comparable to previous studies [23, 24].”
Validation of the Brazilian Portuguese version of the Pittsburgh Sleep Quality Index. (2011, result): “Similar internal consistencies were obtained by other validation studies of the PSQI-BR in other languages [16,17].”