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Functional Outcomes of Sleep Questionnaire (FOSQ)

Name of questionnaire Functional Outcomes of Sleep Questionnaire (FOSQ)
Type of original questionnaire-description, age/population Disease-specific quality of life questionnaire to determine functional status in adults; measures are designed to assess the impact of disorders of excessive sleepiness on multiple activities of everyday living and the extent to which these abilities are improved by effective treatment.
Number of items 30 (long form), 10 (short form)
Number of domains & categories 5 subscales
Name of categories/domains Activity level, vigilance, intimacy and sexual relationships, general productivity, social outcome
Scaling of items 4 to 6-point scale for each item; total score equals the mean scores for each subscale multiplied by the number of subscales answered (total score range 5-20, with higher scores indicating better functional status)
Scoring available: with permission or free Permission required, no cost
Scoring test-retest reliability Yes, total scale: alpha = 0.95
Scoring internal consistency Yes, total scale: r = 0.90
Validity Yes, concurrent validity using SIP and the SF36; discriminant validity present
Available forms (short and/or long etc.) FOSQ (long form) and FOSQ-10 (short form)
Language English
Translations in other languages (if yes, then list the languages) Swedish, German, Spanish, Turkish, Norwegian, Iranian, Chinese Mandarin
Developer(s) name Terri Weaver, PhD, RN, FAAN
Developer contact information for permission College of Nursing, Department of Biobehavioral Nursing Science and College of Medicine
University of Illinois at Chicago
845 South Damen Ave. MC 802, Chicago, IL, 60612, USA.
teweaver@uic.edu
Availability of questionnaire: needs permission from developer, cost or freely available Use with permission from developer
Limitations Long questionaire; a shorter version, FOSQ-10 is available
Link to the questionnaire (if available) Not available
Other comments Self-administered. FOSQ-10 has similar validity and reliability as the FOSQ with an internal consistency of α = 0.87.
Patient populations in who questionnaire has been validated Adults, pregnant women, patients with obstructive sleep apnea
References (including original publication, validity and reliability in different countries/languages, populations and long/short versions)
  1. Weaver TE, Laizner AM, Evans LK, et al. An instrument to measure functional status outcomes for disorders of excessive sleepiness. 1997;20:835-43.
  2. Chasens ER, Ratcliffe SJ, Weaver TE. Development of the FOSQ-10: a short version of the Functional Outcomes of Sleep Questionnaire. 2009 Jul;32(7):915-9.
  3. Ferrer M, Vilagut G, Monasterio C, Montserrat JM, Mayos M, Alonso J. Measurement of the perceived impact of sleep problems: the Spanish version of the functional outcomes sleep questionnaire and the Epworth sleepiness scale. Med Clin (Barc). 1999 Sep 11;113(7):250-5.
  4. Izci B, Firat H, Ardiç S, Köktürk O, Gelir E, Altinörs M. Adaptation of functional outcomes of sleep questionnaire (FOSQ) to Turkish population. Tuberk Toraks. 2004;52(3):224-30.
  5. Stavem K, Kjelsberg FN, Ruud EA. Reliability and validity of the Norwegian version of the Functional Outcomes of Sleep Questionnaire. Qual Life Res. 2004 Mar;13(2):541-9.
    Arch Bronconeumol. 2007 May;43(5):256-61.
  6. Korpe L, Lundgren J, Dahlström L.
    Psychometric evaluation of a Swedish version of the Functional Outcomes of Sleep Questionnaire, FOSQ. Acta Odontol Scand. 2013 Sep;71(5):1077-84.
  7. 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. 2016 Feb;25(2):337-341.
  8. Tsai S, Shun S, Lee P, et al. Validation of the Chinese Version of the Functional Outcomes of Sleep Questionnaire-10 in Pregnant Women. Res Nurs Health. 2016 Dec;39(6):463-471.
  9. Ray de Castro J, Rosales-Mayor E, Weaver TE. Reliability and Validity of the Functional Outcomes of Sleep Questionnaire - Spanish Short Version (FOSQ-10SV) in Peruvian Patients With Obstructive Sleep Apnea. J Clin Sleep Med. 2018 Apr 15;14(4):615-621.
  10. Billings ME, Rosen CL, Auckley D, Benca R, Foldvary-Schaefer N, Iber C, Zee PC, Redline S, Kapur VK. Psychometric Performance and Responsiveness of the Functional Outcomes of Sleep Questionnaire and Sleep Apnea Quality of Life Instrument in a Randomized Trial: The HomePAP Study. 2014 Dec 1;37(12):2017-24.
  11. Fitzpatrick J, Kerns ES, Kim ED, et al. Functional outcomes of sleep predict cardiovascular intermediary outcomes and all-cause mortality in patients on incident hemodialysis. J Clin Sleep Med. 2021 Aug 1;17(8):1707-1715.
Updated by Melissa Maloney, MD
The last date of update February 2023