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.
References
Strollo, P. J, Jr, & Rogers, R. M. (1996). Obstructive sleep apnea. New England Journal of Medicine, 334, 99–104.
Al Ghanim, N., Comondore, V. R., Fleetham, J., Marra, C. A., & Ayas, N. T. (2008). The economic impact of obstructive sleep apnea. Lung, 186, 7–12.
Reimer, M. A., & Flemons, W. W. (2003). Quality of life in sleep disorders. Sleep Medicine Reviews, 7, 335–349.
Weaver, T. E., Laizner, A. M., Evans, L. K., Maislin, G., Chugh, D. K., Lyon, K., et al. (1997). An instrument to measure functional status outcomes for disorders of excessive sleepiness. Sleep, 20, 835–843.
Chasens, E. R., Ratcliffe, S. J., & Weaver, T. E. (2009). Development of the FOSQ-10: A short version of the Functional Outcomes of Sleep Questionnaire. Sleep, 32, 915–919.
Wild, D., Grove, A., Martin, M., Eremenco, S., McElroy, S., Verjee- Lorenz, A., et al. (2005). Principles of good practice for the translation and cultural adaptation process for patient-reported outcomes (PRO) measures: Report of the ISPOR task force for translation and cultural adaptation. Value Health, 8, 94–104.
Iber, C. A.-I. S., Chesson, A. L, Jr, & Quan, S. F. (2007). The AASM manual for the scoring of sleep and associated events, rules, terminology and technical specifications (1st ed.). Westchester: American Academy of Sleep Medicine.
Cirignotta, F. (2004). Classification and definition of respiratory disorders during sleep. Minerva Medica, 95, 177–185.
Ware, J., Kosinski, M. M., & Keller, S. (1996). A 12 item Short Form Health Survey: Construction of scales and preliminary tests of reliability and validity. Medical Care, 34, 220–233.
Montazeri, A., Vahdaninia, M., Mousavi, S. J., & Omidvari, S. (2009). The Iranian version of 12 item Short Form Health Survey (SF-12): Factor structure, internal consistency and construct validity. BMC Public Health, 9, 341.
Johns, M. W. (1991). A new method for measuring daytime sleepiness: The Epworth sleepiness scale. Sleep, 14, 540–555.
Sadeghniiat Haghighi, K., Montazeri, A., Khajeh Mehrizi, A., Aminian, O., Rahimi Golkhandan, A., Saraei, M., et al. (2013). The Epworth Sleepiness Scale: Translation and validation study of the Iranian version. Sleep Breath, 17, 419–426.
Nunnally, J. C., & Bernstein, I. H. (1994). Psychometric theory (3rd ed.). New York: McGraw-Hill.
Stavem, K., Kjelsberg, F. N., & Ruud, E. A. (2004). Reliability and validity of the Norwegian version of the Functional Outcomes of Sleep Questionnaire. Quality of Life Research, 13, 541–549.
Banhiran, W., Assanasen, P., Metheetrairut, C., Nopmaneejumruslers, C., Chotinaiwattarakul, W., & Kerdnoppakhun, J. (2012). Functional outcomes of sleep in Thai patients with obstructive sleep-disordered breathing. Sleep Breath, 16, 663–675.
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Rahavi-Ezabadi, S., Amali, A., Sadeghniiat-Haghighi, K. et al. Adaptation of the 10-Item Functional Outcomes of Sleep Questionnaire to Iranian Patients with Obstructive Sleep Apnea. Qual Life Res 25, 337–341 (2016). https://doi.org/10.1007/s11136-015-1081-9
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DOI: https://doi.org/10.1007/s11136-015-1081-9