Validity and reliability of the Indonesian version of the Pittsburgh Sleep Quality Index in adolescents

Aim The study aims to examine the psychometric properties of the Pittsburgh Sleep Quality Index-Indonesian version. Background The Pittsburgh Sleep Quality Index has never been translated into Bahasa. Design This study employs a cross-sectional and correlational study. Methods Data were collected from 528 adolescents of junior high school age (13-16 years) during August to September 2014. All participants agreed on the Indonesian version of Pittsburgh Sleep Quality Index and Beck Depression Inventory-II. Psychometric properties were examined including internal consistency, construct validity and known group validity, and the receiver operating characteristic curve was used to measure the cut-off point. Results The Cronbach's alpha for the Pittsburgh Sleep Quality Index-Indonesian version was adequate. There were positive correlations between the total score and seven component scores. Construct validity revealed that the total score of the Pittsburgh Sleep Quality Index-Indonesian version was correlated with the total score of the Indonesian version of the Beck Depression Inventory-II. Known group validity indicated that adolescents without depression risk had better sleep quality. According to receiver operating characteristic curve analysis, the cut-off point at a score of 6.5 indicated the best possible relationship of sensitivity and specificity. Conclusion The Pittsburgh Sleep Quality Index-Indonesian version has high reliability and validity for screening sleep quality among adolescents.