ArticleSleep & breathing = Schlaf & Atmung2025
The Pittsburgh sleep quality index-2 (PSQI-2): the validity of a two-item sleep quality screener in Brazilian adults.
Article in Sleep & breathing = Schlaf & Atmung, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Influence of Preoperative Cognitive Function, Self-Efficacy, and Postoperative Psychological Counselling on Anxiety and Depression Levels in Patients Undergoing Botulinum Toxin Injections.Actas espanolas de psiquiatria · 2026Article
- Psychometric properties of the two-item Pittsburgh Sleep Quality Index (PSQI-2) in a cohort of community-dwelling older men: the MrOS sleep study.Npj biological timing and sleep · 2026Article
- Performance of a two-item sleep quality measure (PSQI-2): a comprehensive evaluation in a multiethnic cohort (MESA Study).Research square · 2026Article
- Sleep patterns, physical activity and glycemic control in newly diagnosed type 2 diabetes patients from a joint perspective: a cross-sectional study.Frontiers in endocrinology · 2026Article
- The status and factors associated with the mental well-being of university students in China: a cross-sectional study.Frontiers in psychiatry · 2026Article
- Sleep and Athletic Performance: A Multidimensional Review of Physiological and Molecular Mechanisms.Journal of clinical medicine · 2025Review
- Psychometric properties of the two-item Pittsburgh Sleep Quality Index (PSQI-2) in a cohort of community-dwelling older men.Research square · 2025Article
- Implementing nature walking groups in mental health services as a transdiagnostic approach to promote recovery: a study protocol for a non-randomised trial.BMC health services research · 2025Article
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Authors and funding
4 authors.
Funding
Abstract
backgroundSeveral instruments are available to assess sleep quality, including the 19-item Pittsburgh Sleep Quality Index (PSQI). As shorter measures may be desirable for use in clinical settings or population-based research, we evaluated the validity of a 2-item sleep quality screener, the PSQI-2.
methodsThe PSQI-2 inquiries about sleep duration and subjective sleep quality over the past 30 days, scoring each from 0 (“very good”; >7 h of sleep) to 3 (“very bad”; < 5 h of sleep). The sum of the two items generates a score from 0 to 6; the higher the score, the worse the sleep quality. This study was conducted with 1,762 adults in a population-based household survey with stratified sampling between October and December 2020 in Brazil. Concurrent validity was assessed using the full PSQI as the reference test.
resultsFactor analysis confirmed a two-factor structure, supporting the selection of PSQI items 1 (subjective sleep quality) and 3 (sleep duration). As PSQI-2 scores increased from 0 to 6, a substantial increase has been found in the prevalence of individuals with poor sleep quality (p <.05). The PSQI-2 had excellent internal consistency (α = 0.94 and ω = 0.85) and known-group validity, with higher scale scores found in individuals with symptoms of depression and anxiety. Considering PSQI > 5 (poor sleep quality) as a reference, the best cut-off point of the PSQI-2 score was ≥ 2, with a sensitivity of 77.9% and specificity of 73.8%. The concurrent validity revealed acceptable performance of the PSQI-2 for the PSQI > 5 and > 7, and exceptional performance for the PSQI > 10 as a reference.
conclusionThe PSQI-2 presents good/excellent validity evidence for screening sleep quality in a sample of Brazilian adults.
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