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Reliability and validity of the Hungarian version of the Pittsburgh Sleep Quality Index (PSQI-HUN): comparing psychiatric patients with control subjects

  • Psychiatrics • Original Article
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Abstract

Purpose

The Pittsburgh Sleep Quality Index is used to evaluate subjective sleep quality, and it is commonly used in clinical research. Subjective sleep quality is also an important clinical measure in patients with psychiatric disorders. The aim of the present study was to evaluate the reliability and validity of the Hungarian version of the Pittsburgh Sleep Quality Index (PSQI-HUN) in both clinical and non-clinical samples.

Methods

The original version of PSQI was translated into Hungarian according to standard guidelines. The PSQI-HUN and the Athens Insomnia Scale (AIS) were subsequently administered to 53 psychiatric patients (schizophrenia, recurrent depressive disorder, mixed anxiety, and depressive disorder) and 178 healthy controls.

Results

Internal consistency as measured by Cronbach’s alpha in the whole sample was 0.79. Pearson’s product-moment correlations between component scores and the global scores were high (0.59–0.88) in the PSQI-HUN indicating the homogeneity of the scale. PSQI-HUN global and component scores differed significantly between psychiatric patients and control subjects. In the psychiatric patient subsample, schizophrenics had lower global scores compared to the other two patient groups. The analysis of convergent validity showed significant correlations between the AIS and the global as well as the component scores of the PSQI-HUN (except the component of sleep latency).

Conclusions

The present study concludes that the PSQI-HUN is a reliable, valid, and standardized measure for assessment of the subjective sleep quality in clinical and research settings.

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Acknowledgments

Authors gratefully acknowledge Örjan de Manzano and Miriam Mosing for their comments and proof reading on the manuscript.

Author information

Authors and Affiliations

  1. Institute of Behavioural Sciences, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Budapest, Hungary

    Johanna Takács, Róbert Bódizs & Péter Przemyslaw Ujma

  2. Department of General Psychology, Pázmány Péter Catholic University, Budapest, Hungary

    Róbert Bódizs

  3. 2nd Department of Pediatrics, Semmelweis University, Budapest, Hungary

    Klára Horváth

  4. Department of Psychiatry and Psychotherapy, Semmelweis University, Budapest, Hungary

    Péter Rajna

  5. Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden

    László Harmat

Authors
  1. Johanna Takács
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  2. Róbert Bódizs
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  3. Péter Przemyslaw Ujma
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  4. Klára Horváth
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  5. Péter Rajna
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  6. László Harmat
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Corresponding author

Correspondence to Johanna Takács.

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Conflict of interest

There are no potential or actual conflicts of interest.

Ethical approval

All procedures were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the Human Research Ethics Committee of the study university (Semmelweis University, Budapest, Hungary, 9094–4/2013/EKZ (125/2013)). Participants received both oral and written information about the study and they signed an informed consent form.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Takács, J., Bódizs, R., Ujma, P.P. et al. Reliability and validity of the Hungarian version of the Pittsburgh Sleep Quality Index (PSQI-HUN): comparing psychiatric patients with control subjects. Sleep Breath 20, 1045–1051 (2016). https://doi.org/10.1007/s11325-016-1347-7

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  • DOI: https://doi.org/10.1007/s11325-016-1347-7

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