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Thirty-five years of the Pittsburgh sleep quality index: a critical appraisal and a path forward for its contemporary use
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DOI：10.1016/j.smrv.2026.102326.png)
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Abstract
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Since its publication in 1989, the Pittsburgh sleep quality index (PSQI) has become one of the most widely used self-report instruments in sleep medicine. Despite its enduring popularity, its extensive adoption has been accompanied by conceptual and methodological concerns regarding its psychometric foundations and the construct it purports to measure.
Keywords:
Pittsburgh sleep quality index (PSQI)
sleep quality
sleep health
clinical assessment
psychometrics
self-report scales
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