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Psychometric properties of the 9-item Ethos brief among obstructive sleep apnea patients
Linkoping Univ, Dept Clin & Expt Med, Linkoping, Sweden.
Jönköping University, School of Health and Welfare, HHJ, Dep. of Nursing Science. Jönköping University, School of Health and Welfare, HHJ. ADULT. Linkoping Univ Hosp, Dept Clin Neurophysiol, Linkoping, Sweden.ORCID iD: 0000-0003-1884-5696
Jönköping University, School of Health and Welfare, HHJ, Dep. of Nursing Science.
Linkoping Univ, Dept Hlth & Soc, Linkoping, Sweden.
2018 (English)In: Journal of Sleep Research, ISSN 0962-1105, E-ISSN 1365-2869, Vol. 27, no 1, SI, p. 284-284, article id P421Article in journal, Meeting abstract (Refereed) Published
Abstract [en]

Objectives/Introduction: Continuous positive airway treatment (CPAP) is the recommended treatment for patients with obstructive sleep apnea (OSA). Outcome measure often focus clinical and/or self-rated variables related to medical condition. However, a brief validated instrument focusing the whole life situation (i.e., ethos) suitable for clinical practice is missing. The aim was to investigate factorial structure, categorical functioning of the response scale and differential item functioning (DIF) across sub-populations of the Ethos brief scale among patients with OSA before and after treat-ment with CPAP is initiated.

Methods: Prospective design, 180 OSA patients (68% men, 59, 66 years, sd 11,51) from CPAP clinics at two hospitals, one university and one county hospital. A clinical assessment and overnight polysomnography scored by a sleep physician was used to diagnose patients. Questionnaires used before treatment initiation, after 6 months and 12 months CPAP treatment were; Ethos brief (9items), Epworth sleepiness scale (ESS, 8 items), Hospital anxiety and depression scale (HADS, 14 items), and short form-12 (SF12, 12items). Validity and reliability of the Ethos was investigated using Rasch and confirmatory factor analysis (CFA) models. In addition measurement invariance, unidimensionality and differential item functioning (DIF) across gender groups, Apnea hypopnea index (AHI)groups and ESS were performed. The reliability of the Ethos was confirmed using both Composite reliability (0.90) and Cronbach′sAlpha (0.90).

Results: The results supported unidimensionalily of the Ethos inboth CFA and the Rasch model. Moreover, no DIF was found across gender, AHI and ESS groups. The results of the DIF were conformed in multigroup CFA. Finally, a latent profile analysis (LPA) was performed to examine the profiles of patients based on their scores in the Ethos. The LPA yielded 2 profiles of the patients with low (n = 42) and high (n = 151) Ethos. Patients in the low profile group were younger, had higher depression scores, lower perceived health, poorer adherence after 6 month and higher BMI.

Conclusions: The Ethos brief scale seems to be a valid tool with robust psychometric properties suitable for use among patients with OSA before and after treatment with CPAP is initiated. Future studies should focus on its predictive validity.

Disclosure: None.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 27, no 1, SI, p. 284-284, article id P421
National Category
Neurology
Identifiers
URN: urn:nbn:se:hj:diva-41678ISI: 000444228300603OAI: oai:DiVA.org:hj-41678DiVA, id: diva2:1252451
Conference
24th Congress of the European-Sleep-Research-Society (ESRS), Basel, SWITZERLAND, SEP 25-28, 2018
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-02Bibliographically approved

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Broström, AndersPakpour, Amir H.

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