Since its introduction in 1989, the Pittsburgh Sleep Quality Index (PSQI) has been widely accepted as a useful tool for evaluating sleep quality and quantity and has been recommended as an essential measure for global sleep and insomnia symptoms.1,2
The PSQI is a self-rating questionnaire in which 19 individual items are used to generate seven component scores relating to the patient’s usual sleep habits:
Each of these components is equally weighted on a 0–3 scale and the sum of these seven components yields one global PSQI score, with a score range of 0–21. Higher scores indicate worse sleep quality. The patient is asked to give the most accurate reply for the majority of days and nights during the monitoring period. The entire index requires 5– 10 minutes for the patient to complete, and 5 minutes to score.1
The good reliability and validity of the PSQI has been shown for patients with psychiatric disorders over the usual monitoring period of 1 month.1 Effectiveness of the PSQI has also been demonstrated in evaluating sleep quality in patients with primary insomnia over a 2-week period.3
Test your patients' quality of sleep by asking them to complete the following test. Start the test
1. Buysse DJ, Reynolds CF, Monk TH, et al. The Pittsburgh Sleep Quality Index: a new instrument for psychiatric practice and research. Psychiatry Res 1989; 28: 193–213.
2. Buysse DJ, Ancoli-Israel S, Edinger JD, et al. Recommendations for a Standard Research Assessment of insomnia. Sleep 2006; 29 (9): 1155– 1173.
3. Backhaus J, Junghanns K, Broocks A, et al. Test-retest reliability and validity of the Pittsburgh Sleep Quality Index in primary insomnia. J Psychosom Res 2002; 53: 737–740.