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Psychometric properties of the Turkish version of modified Freedman questionnaire for sleep quality

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Abstract

To investigate the psychometric characteristics of the modified Freedman Sleep Quality Questionnaire (mFSQQ) to assess sleep in Turkish intensive care unit (ICU) patients. This prospective cross-sectional study was conducted between December 2020 and August 2021 with patients older than 18 years, who stayed in the ICU for ≥ 24 h and were cooperative with a Glasgow Coma Scale score ≥ 10 in medical and surgical ICUs of a university hospital. During the adaptation of the items of the mFSQQ, language, content, and construct validity were examined, and the test–retest method and internal consistency were used to examine its reliability. The content validity index of the questionnaire was 0.82. The Kaiser–Meyer–Olkin measure of sampling adequacy was 0.71, which indicates adequate sampling; Bartlett’s test of sphericity was χ2 = 2868.97, p < 0.001. The Turkish version had three subscales. The factor loadings of the items were above 0.30, and the factors explained 60.59% of the total variance. The test–retest reliability coefficient was 0.85, indicating high consistency. The Cronbach α reliability coefficient was 0.80, indicating high reliability. The item-total correlations were found to be sufficient (between 0.25 and 0.78). The Turkish version of the mFSQQ showed good psychometric characteristics and can be used as a routine evaluation instrument to determine sleep quality by the ICU team and to promote sleep.

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Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Faculty of Health Sciences, Department of Nursing, Bursa Uludag University, Nilüfer, Bursa, 16059, Turkey

    Öznur Erbay Dallı

  2. Faculty of Nursing, Department of Internal Medicine Nursing, Ege University, Bornova, İzmir, 35100, Turkey

    Yasemin Yıldırım

Authors
  1. Öznur Erbay Dallı
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  2. Yasemin Yıldırım
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Contributions

ÖED: conceptualization, methodology, formal analysis, ınvestigation, resources, data curation, writing—original draft, writing—review and editing, visualization. YY: conceptualization, methodology, data curation, writing—original draft, writing—review and editing, visualization, project administration.

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Correspondence to Öznur Erbay Dallı.

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The authors declare that they have no conflicts of interest.

Ethical considerations

The permission to adapt and use the modified version of the questionnaire was obtained from Dr. Bihari via e-mail. The study protocol was reviewed and approved by the Clinical Research Ethics Committee of the School of Medicine of Uludag University (Approval #: 2020-20/20) and the hospital administration. Informed consent was obtained from the patients.

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Dallı, Ö.E., Yıldırım, Y. Psychometric properties of the Turkish version of modified Freedman questionnaire for sleep quality. Sleep Biol. Rhythms 20, 459–465 (2022). https://doi.org/10.1007/s41105-022-00389-2

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  • DOI: https://doi.org/10.1007/s41105-022-00389-2

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