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Qual Life Res. 2016 Feb;25(2):337-41. doi: 10.1007/s11136-015-1081-9. Epub 2015 Jul 28.

Adaptation of the 10-Item Functional Outcomes of Sleep Questionnaire to Iranian Patients with Obstructive Sleep Apnea.

Author information

1
Tehran University of Medical Sciences, Tehran, Iran.
2
Occupational Sleep Research Center, Otorhinolaryngology Research Center, Otorhinolaryngology Head and Neck Surgery Department, Imam Khomeini Educational Complex Hospital, Valiasr Hospital, Tehran University of Medical Sciences, Tehran, Iran. a_amali@sina.tums.ac.ir.
3
Occupational Sleep Research Center, Tehran University of Medical Sciences, Tehran, Iran.
4
Health Metrics Research Center, Iranian Institute for Health Sciences Research, ACECR, Tehran, Iran.

Abstract

PURPOSE:

The purpose of this study was to evaluate the psychometric properties of the Farsi version of 10-item Functional Outcomes of Sleep Questionnaire (FOSQ-10) in Iranian patients with obstructive sleep apnea (OSA).

METHODS:

The FOSQ-10 was translated into Farsi using the standard forward-backward method. One hundred patients who fulfilled the inclusion criteria completed a series of questionnaires including IR-FOSQ-10, Medical Outcome Survey Short Form 12 (SF-12) and Epworth Sleepiness Scale (ESS). Internal consistency, test-retest reliability, concurrent validity, discriminant validity and responsiveness of IR-FOSQ-10 were investigated.

RESULTS:

The Cronbach's alpha coefficient was 0.85 in IR-FOSQ-10 total score and ranged from 0.78 to 0.83 in each subscale. The test-retest reliability demonstrated by intraclass coefficient was 0.92. There were significant moderate-to-good negative correlations between IR-FOSQ-10 subscales and ESS except for sexual relationship subscale. FOSQ-10 subscales generally correlated higher with related subscales of SF-12. The IR-FOSQ-10 was able to distinguish patients with abnormal sleepiness score from those with normal sleepiness score. The results of sensitivity to change proved that the IR-FOSQ-10 was able to detect changes after continuous positive airway pressure therapy.

CONCLUSION:

The psychometric properties of the IR-FOSQ-10 suggest that it is a reliable and valid measure among Iranian patients with OSA.

KEYWORDS:

Epworth Sleepiness Scale; Functional Outcomes of Sleep Questionnaire; Medical Outcome Survey Short Form 12; Obstructive sleep apnea; Reliability; Validity

PMID:
26216586
DOI:
10.1007/s11136-015-1081-9
[Indexed for MEDLINE]

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