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- Kraepelien, Martin, et al.
(författare)
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A very brief self-report scale for measuring insomnia severity using two items from the Insomnia Severity Index-development and validation in a clinical population
- 2021
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Ingår i: Sleep Medicine. - : Elsevier. - 1389-9457 .- 1878-5506. ; 81, s. 365-374
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To develop a very brief scale with selected items from the Insomnia Severity Index (ISI), and to investigate the psychometric properties of the proposed scale in a psychiatric sample. Methods: Patient data from seven Cognitive Behavioral Therapy (CBT) for insomnia trials and from regular care were used in psychometric analyses (N = 280-15 653). The samples included patients screening (N = 6936) or receiving treatment (N = 1725) for insomnia and other psychiatric conditions. Six criteria relating to component structure, sensitivity to change and clinical representativeness were used to select items. Psychometric analyses for the proposed very brief scale were performed. Results: One item representing satisfaction/dissatisfaction with current sleep pattern and one item representing interferences with daily functioning, were selected to create the 2-item ISI version. Correlations with the full scale were high at screening, pre and post, and for change (0.82-0.94). Categorical omega was omega(C) = 0.86. With a cut-off of 6 points, the scale could detect Insomnia Disorder with a sensitivity of 84% and a specificity of 76%, which was close to the full ISI showing 86% and 80% respectively. Conclusions: The systematic psychometric evaluation based on a large sample from different contexts makes the proposed 2-item ISI version (ISI-2) a strong candidate for a very brief scale measuring insomnia, both for detecting cases and for measuring change during CBT with an overall high discriminative validity. ISI-2 is especially useful in clinical settings or population studies where there is a need to measure more than one condition at a time without overburdening patients. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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- Westergren, Albert, et al.
(författare)
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Measurement properties of the Minimal Insomnia Symptom Scale (MISS) as an insomnia screening tool among adults and the elderly
- 2015
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Ingår i: Sleep Medicine. - : Elsevier BV. - 1389-9457 .- 1878-5506. ; 16:3, s. 379-384
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Tidskriftsartikel (refereegranskat)abstract
- Background: The psychometric properties of the 3-item Minimal Insomnia Symptom Scale (MISS) have been evaluated using classical test theory. Different cut-offs for identifying insomnia have been suggested in two age groups (≥6 and ≥7 among adult and elderly people, respectively). The aim of this study was to test the measurement properties of the MISS using the Rasch measurement model, with special emphasis on differential item functioning by gender and age.Methods: Cross-sectional MISS data from adult (age 20-64 years; n=1075) and elderly (age 65+; n=548) populations were analysed by the Rasch measurement model.Results: Data generally met Rasch model requirements and the scale could separate between two distinct groups of people, but there was differential item functioning by age. The difference between the adult and elderly samples was lower for the originally recommended ≥6 points cut-off (0.09 logits) than for the ≥7 points cut-off (0.23 logits), but greater at the lower and higher ends of the scale.Conclusions: This study provides support for the measurement properties of the MISS. However, caution should be exercised in comparing raw MISS scores between age groups, but applying a ≥6 cut-off appears to allow for valid comparisons between adults and elderly
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