Karin Brochstedt Dieperink1,2,3,4, Caroline Matilde Elnegaard5, Bodil Winther6, Anna Lohman7, Ida Zerlang8, Sören Möller9,10, Graziella Zangger5. 1. Department of Oncology, Odense University Hospital, Odense, Denmark. karin.dieperink@rsyd.dk. 2. REHPA, the Danish Knowledge Centre for Rehabilitation and Palliative Care, University of Southern Denmark and Odense University Hospital, Odense, Denmark. karin.dieperink@rsyd.dk. 3. Academy of Geriatric Cancer Research, AgeCare, Odense University Hospital, Southern Boulevard 29, DK-5000, Odense C, Denmark. karin.dieperink@rsyd.dk. 4. Department of Clinical Research, University of Southern Denmark, Odense, Denmark. karin.dieperink@rsyd.dk. 5. REHPA, the Danish Knowledge Centre for Rehabilitation and Palliative Care, University of Southern Denmark and Odense University Hospital, Odense, Denmark. 6. Department of Oncology, Lillebaelt Hospital, Vejle, Denmark. 7. Department of Oncology, Zealand University Hospital, Naestved, Denmark. 8. Department of Oncology, Regional Hospital West Jutland, Herning, Denmark. 9. OPEN - Open Patient data Explorative Network Odense University Hospital, Odense, Denmark. 10. Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
Abstract
PURPOSE: Insomnia is a frequent sleeping disorder in the general and clinical population. 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. The Insomnia Severity Index (ISI) could be the needed tool if found valid and reliable. Hence, the aim of this study is to evaluate elements of the psychometric properties of the Danish version of ISI (ISI-DK). METHODS: Outpatients from three hospital wards and one rehabilitation center were asked to complete the ISI-DK twice, 2 weeks apart. Internal consistency, discriminative validity, test-retest reliability, and measurement error was assessed. RESULTS: The ISI-DK was completed by 249 (79.0%) participants the first time, and 163 (65.5%) the second time. Respondents had a mean age of 58.2 years (SD 13.5) and 63.5% were women. All but one of the discriminative hypotheses was accepted. 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. The test-retest reliability was good, as the intraclass correlation was 0.90 (95% CI: 0.87; 0.93). Ceiling and floor effects were low < 4.4%. Standard error of measurement was 2.52 and smallest detectable change 6.99. CONCLUSION: 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.
PURPOSE:Insomnia is a frequent sleeping disorder in the general and clinical population. 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. The Insomnia Severity Index (ISI) could be the needed tool if found valid and reliable. Hence, the aim of this study is to evaluate elements of the psychometric properties of the Danish version of ISI (ISI-DK). METHODS: Outpatients from three hospital wards and one rehabilitation center were asked to complete the ISI-DK twice, 2 weeks apart. Internal consistency, discriminative validity, test-retest reliability, and measurement error was assessed. RESULTS: The ISI-DK was completed by 249 (79.0%) participants the first time, and 163 (65.5%) the second time. Respondents had a mean age of 58.2 years (SD 13.5) and 63.5% were women. All but one of the discriminative hypotheses was accepted. 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. The test-retest reliability was good, as the intraclass correlation was 0.90 (95% CI: 0.87; 0.93). Ceiling and floor effects were low < 4.4%. Standard error of measurement was 2.52 and smallest detectable change 6.99. CONCLUSION: 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.
Authors: Marco Fabbri; Alessia Beracci; Monica Martoni; Debora Meneo; Lorenzo Tonetti; Vincenzo Natale Journal: Int J Environ Res Public Health Date: 2021-01-26 Impact factor: 3.390
Authors: Ellen Moseholm; Julie Midtgaard; Signe Bollerup; Ása D Apol; Oskar B Olesen; Sofie Jespersen; Nina Weis Journal: Int J Environ Res Public Health Date: 2022-08-15 Impact factor: 4.614