![]() ![]() ![]() Thus, insomnia screening is dependent on validated tools with a low administrative burden. However, insomnia screening is a useful and cost-effective method to separate patients with minor or temporary symptoms from patients with severe symptoms before referring patients to further diagnostics. According to the European Insomnia Guideline, the diagnostic procedure for insomnia should include a clinical interview with sleep history, sleep diaries, and a physical examination. To prevent chronic insomnia, it is important to diagnose symptoms and initiate treatment of the underlying causes to prevent further morbidity. Insomnia is often concurrent with other medical conditions and research has shown that almost 10% of the patients seen in the primary care setting suffer from chronic insomnia. With a major health impact, insomnia has been shown to diminish quality of life and increase the risk of morbidity and mortality. Insomnia, characterized by having difficulties initiating or maintaining sleep, early awakening and/or poor sleep, is one of the most common sleep disorders with prevalence rates in general populations between 10 and 20%. This preliminary assessment showed encouraging results supporting the ISI-DK as a valid and reliable tool for screening insomnia severity in Danish outpatients with a medical condition, but further assessments are needed. Standard error of measurement was 2.52 and smallest detectable change 6.99. Ceiling and floor effects were low < 4.4%. The test-retest reliability was good, as the intraclass correlation was 0.90 (95% CI: 0.87 0.93). Internal consistency was high in the global scale at 0.90 and good with Cronbach’s alpha at 0.75–0.88 in the proposed subscales. All but one of the discriminative hypotheses was accepted. Respondents had a mean age of 58.2 years (SD 13.5) and 63.5% were women. The ISI-DK was completed by 249 (79.0%) participants the first time, and 163 (65.5%) the second time. Internal consistency, discriminative validity, test-retest reliability, and measurement error was assessed. Outpatients from three hospital wards and one rehabilitation center were asked to complete the ISI-DK twice, 2 weeks apart. Hence, the aim of this study is to evaluate elements of the psychometric properties of the Danish version of ISI (ISI-DK). The Insomnia Severity Index (ISI) could be the needed tool if found valid and reliable. With an increasing proportion of health care services being provided as outpatient care, a short, valid and reliable tool is needed to identify insomnia in medical patients under outpatient care in Denmark. Insomnia is a frequent sleeping disorder in the general and clinical population.
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