Abstract
Pittsburg Sleep Quality Index (PSQI) is a widely used standardized instrument to assess sleep quality in clinical and research settings. Objective of the study was to translate the PSQI into Sinhala language and validate using a combined qualitative and quantitative approach. Every fifth patient aged 18-60 years who attended the out-patients department of a tertiary care hospital was recruited. PSQI was translated into Sinhala using a combined qualitative and quantitative approach. Internal consistency was measured using Cronbach's alpha. Construct validity was assessed by comparing the scores in patients who were identified as having depressive disorder according to the Centre for Epidemiologic Studies Depression Scale (CES-D) and those without depressive disorder. Forty-six participants with depression were compared with 159 non depressed controls. Mean PSQI component scores were significantly higher in depressed patients in 5 components. Factor analysis identified a single component explaining 53.53% of the variance. Cronbach's alpha of 0.85 indicated a high internal consistency. The Sinhala translation of the PSQI is a valid and reliable tool to assess sleep quality.
Highlights
Introduction Pittsburg Sleep QualityIndex (PSQI) is a widely used standardized instrument to assess sleep quality in clinical and research settings
Mean Pittsburg Sleep Quality Index (PSQI) component scores were significantly higher in depressed patients in 5 components
In clinical practice, the number of hours of sleep is used as an indicator of sleep quality
Summary
Index (PSQI) is a widely used standardized instrument to assess sleep quality in clinical and research settings. Medical and neurological conditions where pain is a major symptom result in poor sleep [1, 2]. It is a feature of a wide range of psychiatric disorders such as mood disorders, psychotic disorders, dementias and anxiety disorders [3]. It is able to identify different stages of sleep. It measures the physiological parameters of sleep using electroencephalogram (EEG), electrooculogram (EOG), electrocardiogram (ECG), or electromyogram (EMG) readings. Use of a sleep laboratory in routine clinical practice is limited by the cost and inconvenience
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