How is the PSQI global score interpreted?

PSQI global score 0–5: good sleep quality; >5: poor sleep quality (sensitivity 89.6%, specificity 86.5% for distinguishing good from poor sleepers). Scores 6–10: mild-moderate disturbance; >10: severe sleep disturbance. Maximum score 21.

What are the PSQI component scores?

Seven components each scored 0–3: C1 subjective sleep quality; C2 sleep latency (time to fall asleep); C3 sleep duration ( 7h=0); C4 sleep efficiency (hours asleep/hours in bed × 100, <65%=3); C5 sleep disturbances; C6 sleep medication use; C7 daytime dysfunction.

Does the PSQI diagnose insomnia disorder?

The PSQI screens for poor sleep quality but does not diagnose insomnia disorder, which requires daytime consequences and occurs ≥3 nights/week for ≥3 months despite adequate sleep opportunity (ICSD-3 criteria). Positive PSQI should prompt clinical interview.

Pittsburgh Sleep Quality Index (PSQI) Calculator

Calculates the Pittsburgh Sleep Quality Index (PSQI) global score (0–21) from 7 component scores: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction. PSQI >5 indicates poor sleep quality.

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Frequently Asked Questions

How is the PSQI global score interpreted?

What are the PSQI component scores?

Does the PSQI diagnose insomnia disorder?