Clinical Definition

PSQI components assess:

  • Sleep Quality: Subjective assessment of sleep
  • Sleep Latency: Time to fall asleep
  • Sleep Duration: Hours of actual sleep
  • Sleep Efficiency: Percentage of time in bed spent sleeping
  • Sleep Disturbances: Factors disrupting sleep
  • Sleep Medication Use: Frequency of sleep aids
  • Daytime Dysfunction: Impact on daily activities

The PSQI generates a global score that indicates overall sleep quality, with higher scores indicating poorer sleep.

Etymology & History

The PSQI was developed by Buysse and colleagues at the University of Pittsburgh in 1989 and has become a widely used sleep assessment tool.

Reference Values & Interpretation

Normal Values

Normal PSQI scores are ≤5, indicating good sleep quality and minimal sleep disturbances.

Abnormal Values

Abnormal PSQI scores are >5, suggesting poor sleep quality and significant sleep disturbances requiring further evaluation.

How It's Measured

The PSQI is a self-administered questionnaire that takes 5-10 minutes to complete, covering sleep patterns over the past month.

Role in Diagnosis

The PSQI helps identify patients with poor sleep quality and guides further sleep evaluation and treatment planning.

Role in Treatment

PSQI scores often improve with effective treatment of sleep disorders, providing a measure of treatment response and sleep quality improvement.

Associated Conditions

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Clinical Guidelines

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Latest Research & Updates

AI-Updated Weekly

Recent research has validated the PSQI in various populations and languages, and digital versions have been developed for easier administration.