Has ISI been psychometrically evaluated for younger age groups? I'm asking because we are looking to add a short scale on sleep to a school survey.
Hello Annika,
The Insomnia severity index, translated Swedish and Chinese versions, have been utilized in children and adolescents. Some psychometric properties (please see below) were described in these populations. I can not recall paediatric studies with the original (English) version of the measure.
References:
Kanstrup, M, et.al. Insomnia in paediatric chronic pain and its impact on depression and functional disability. Eur J Pain, Vol. 18 (8): 1094-102, 2014.
ISI showed satisfactory psychometric properties in this sample, including internal consistency and concurrent criteria validity.
Chung, Ka-Fai, et.al. Assessing insomnia in adolescents: comparison of Insomnia Severity Index, Athens Insomnia Scale and Sleep Quality Index. Sleep Med, Vol. 12 (5): 463-70, 2011.
The Cronbach's alpha of ISI was 0.83 and the 2-week test-retest reliability was 0.79. The area under curve of ISI was 0.85, the optimal cut-offs for ISI was a total score of nine (sensitivity/specificity: 0.87/0.75).
Best wishes, Tatyana
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