RESULTS: The mean global Pittsburgh Sleep Quality Index score among Danish adolescents was 5.86 (3.13). For internal consistency the Cronbach's alpha was calculated, for test-retest reliability the interclass correlation coefficient was computed, and for validity the Pearson's correlation was calculated. Apart from the Pittsburgh Sleep Quality Index, the students also completed the five-item World Health Organization Well-being Index and the 10-item Perceived Stress Scale. Data was collected on two occasions approximately 6 weeks apart using online surveys. The sample consisted of 55% women, and the mean age of the sample was 17.87 (2.52) years. METHODS: Data were collected from 719 students from 17 different upper secondary schools. The aim of this study is to establish the internal consistency, test-retest reliability and convergent validity of the Danish version of the Pittsburgh Sleep Quality Index in adolescents. The validity and reliability of the Danish version of the instrument has not yet been established. AIM: The Pittsburgh Sleep Quality Index is a widely used measure of sleep quality.
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