Reliability and validity of the Hungarian version of the Pittsburgh Sleep Quality Index (PSQI-HUN): comparing psychiatric patients with control subjects.
OBJECTIVE
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.
Institute of Behavioural Sciences, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Budapest, Hungary. spss.stat@gmail.com.
Johanna
J
Takács
Institute of Behavioural Sciences, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Budapest, Hungary.|Department of General Psychology, Pázmány Péter Catholic University, Budapest, Hungary.
Róbert
R
Bódizs
Institute of Behavioural Sciences, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Budapest, Hungary.
Péter Przemyslaw
PP
Ujma
2nd Department of Pediatrics, Semmelweis University, Budapest, Hungary.
Klára
K
Horváth
Department of Psychiatry and Psychotherapy, Semmelweis University, Budapest, Hungary.
Péter
P
Rajna
Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.
László
L
Harmat
D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D006814:Hungary; D008297:Male; D001523:Mental Disorders / Q000175:diagnosis* / Q000523:psychology*; D008875:Middle Aged; D011567:Psychiatric Department, Hospital; D011594:Psychometrics / Q000706:statistics & numerical data*; D012016:Reference Values; D012893:Sleep Wake Disorders / Q000175:diagnosis* / Q000523:psychology*; D011795:Surveys and Questionnaires
Pittsburgh Sleep Quality Index; Psychiatric disorders; Reliability; Sleep disorders; Validity