Pittsburgh Sleep Quality Index (PSQI)
Based on Buysse et al. (1989) — 9-item sleep quality assessment
How well have you been sleeping over the past month? The PSQI is the most widely used sleep quality assessment tool worldwide. It measures 7 components of sleep quality with excellent reliability (α = 0.83), sensitivity of 89.6%, and specificity of 86.5%.
What Is the Pittsburgh Sleep Quality Index?
The Pittsburgh Sleep Quality Index (PSQI), developed by Buysse et al. in 1989, is the most widely used sleep quality assessment tool worldwide. It assesses subjective sleep quality over the past month across 7 components: Subjective Sleep Quality, Sleep Latency, Sleep Duration, Sleep Efficiency, Sleep Disturbances, Sleep Medication Use, and Daytime Dysfunction.
The PSQI consists of 9 questions (4 open-ended and 5 multiple-choice). A global score ≥5 is widely used as the cutoff for poor sleep quality.
Scoring Guide
PSQI Global Score = sum of 7 component scores (each 0-3), range 0-21. ≥5 indicates poor sleep quality (sensitivity 89.6%, specificity 86.5%). 7 components: C1 Subjective Sleep Quality, C2 Sleep Latency, C3 Sleep Duration, C4 Sleep Efficiency, C5 Sleep Disturbances, C6 Sleep Medication Use, C7 Daytime Dysfunction. Note: This is a screening tool, not a diagnostic instrument.
Result Interpretation
After completing the 9 questions, you'll receive an immediate, detailed report with:
- Your score — calculated automatically based on your responses
- Score interpretation — what your score means in practical terms
- Context — how your results compare to general population norms where available
All results are displayed instantly on screen. No account, email, or login required.