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Reliability and Validity of Gujarati Pittsburgh Sleep Quality Index: A Cross-sectional Study
YC04-YC07
Correspondence
Dr. Darshana M Nariya,
Nootan College of Physiotherapy, Sankalchand Patel University,
Visngar-384315, Gujarat, India.
E-mail: darshananariya072@gmail.com
Introduction: Poor quality of sleep is a common symptom of many sleep disorders. Pittsburgh Sleep Quality Index (PSQI) is self-administered questionnaire that measures quality of sleep of an individual. It includes subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medications and day time sleepiness.
Aim: To translate English PSQI into Gujarati Language and to find reliability and validity of Gujarati version of PSQI.
Materials and Methods: This cross-sectional study was conducted from August 2020 to February 2021. Permission was taken to translate original English PSQI to Gujarati language from the Mapi Research Trust. This study was carried out in four phases: 1) Cultural adaptation and translation of PSQI into Gujarati language; 2) Face and content validation by expert clinical review; 3) Cognitive interviews; 4) Test retest reliability. Forward-backward-forward method was used to translate PSQI. The consensus method was used to find face and content validity of Gujarati PSQI. The group of experts having mean experience of 10.5 years in different fields examined each item of Gujarati PSQI. Total 120 participants aged between 18-60 years were included in this study. To find reliability of Gujarati PSQI, internal consistency and test retest reliability was determined. Statistical Package for the Social Sciences (SPSS) vesrsion 24.0 was used to analyse the data. Test retest reliability was determined by Intraclass Correlation Coefficient (ICC) and internal consistency was calculated by chronbach’s alpha.
Results: Gujarati version of PSQI showed excellent test retest reliability as evidenced by high ICC (ICC=0.87) and high internal consistency (α=0.93).
Conclusion: Gujarati version of the PSQI has excellent reliability and good face and content validity. It is adequate and useful for evaluation of quality of sleep in Gujarati speaking population.