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01-03-2021 | Insomnia | Psychiatrics • Original Article

Validity and reliability of the Persian version of the Insomnia Diurnal Impact Scale (IDIS)

Authors: Hoda Doos Ali Vand, Fahimeh AhmadianVargahan, Morteza Charkhabi, Mir Farhad Ghaleh Bandi, Khosro Sadeghniiat Haghighi, Mojtaba Habibi

Published in: Sleep and Breathing | Issue 1/2021

Abstract

Background

Insomnia disorder is characterized by nighttime and daytime symptoms. The aim of this study was to assess the validity and reliability of a Persian version of the Insomnia Diurnal Impact Scale (IDIS) as a screening tool to evaluate diurnal effects of sleep fragmentation in Iranians.

Methods

Of 300 individuals recruited, 150 had insomnia disorder based on DSM-5 criteria and 150 were good sleepers based on research diagnostic criteria. All subjects completed the IDIS, Pittsburg Sleep Quality Index, Insomnia Severity Index, Depression-Anxiety-Stress Scale-21, and sleep diaries.

Results

The Persian version of the IDIS showed adequate psychometric properties for internal consistency and test-retest reliability. The result of principal component analysis confirmed a single component with six items as the final structure of the scale in the insomniac group. The total IDIS score significantly correlated with the Pittsburg Sleep Quality Index, Insomnia Severity Index, and subscales of Depression-Anxiety-Stress Scale-21 verifying the convergent validity of the scale. The Persian version of the IDIS significantly discriminated the insomniac group from the non-insomniac group. The result of the fit estimates for the one-factor unidimensional model met the previously specified fit criteria and adequately fit the data in the non-insomniac group.

Conclusion

The Persian version of the IDIS was shown to be a valid and reliable clinical tool in evaluating the daytime consequences of insomnia in Iranians.

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Title: Validity and reliability of the Persian version of the Insomnia Diurnal Impact Scale (IDIS)
Authors: Hoda Doos Ali Vand
Fahimeh AhmadianVargahan
Morteza Charkhabi
Mir Farhad Ghaleh Bandi
Khosro Sadeghniiat Haghighi
Mojtaba Habibi
Publication date: 01-03-2021
Publisher: Springer International Publishing
Keyword: Insomnia
Published in: Sleep and Breathing / Issue 1/2021
Print ISSN: 1520-9512
Electronic ISSN: 1522-1709
DOI: https://doi.org/10.1007/s11325-020-02116-y

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