![]() Morin, no study has investigated the measurement properties of the Danish version of the ISI and with his agreement this study was executed. However, although the translation process was professionally controlled, according to the primary author of the ISI Charles M. It has already been translated into more than 50 languages, including Danish, by the Mapi Research Trust, the official distributor of the ISI. ![]() The ISI has the potential to become this valuable tool. Of the few insomnia-specific PRO instruments available, the ISI is designed to capture patient-perceived insomnia severity and impact on daytime functioning.Ī short, valid, and reliable tool is needed to identify insomnia in patients under outpatient care, as a growing proportion of health care services in Europe, and especially in Denmark, are provided as outpatient care. In comparison to other PRO sleep measures, the ISI has diagnostic properties, and can be completed in a few minutes, diminishing the response burden. The ISI has been translated into multiple languages, validated in 12 countries and as a web-based measurement. The ISI is a brief seven item self-rated instrument, increasingly used to assess insomnia based on criteria from the International Classification of Sleep Disorders. The Insomnia Severity Index (ISI), developed by Morin, is currently one of the most used PRO insomnia questionnaires. The use of patient reported outcomes (PRO) has therefore become increasingly important in assessing the impact of insomnia and its treatment of health status and daily functioning. 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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