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Reliability of Actigraphy and Subjective Sleep Measurements in Adults: the Design of Sleep Assessments
Karolinska Inst, Inst Environm Med, Unit Occupat Med, Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Occupational and Environmental Medicine. (Magnus Svartengren)
Karolinska Inst, Inst Environm Med, Unit Intervent & Implementat Res, Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Occupational and Environmental Medicine. (Magnus Svartengren)
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2017 (English)In: Journal of Clinical Sleep Medicine (JCSM), ISSN 1550-9389, E-ISSN 1550-9397, Vol. 13, no 1, 39-47 p.Article in journal (Refereed) Published
Abstract [en]

STUDY OBJECTIVES: The aim of the study was to investigate how many nights of measurement are needed for a reliable measure of sleep in a working population including adult women and men.

METHODS: In all, 54 individuals participated in the study. Sleep was assessed for 7 consecutive nights using actigraphy as an objective measure, and the Karolinska sleep diary for a subjective measure of quality. Using intra-class correlation and the Spearman-Brown formula, calculations of how many nights of measurements were required for a reliable measure were performed. Differences in reliability according to whether or not weekend measurements were included were investigated. Further, the correlation between objectively (actigraphy) measured sleep and subjectively measured sleep quality was studied over the different days of the week.

RESULTS/CONCLUSIONS: The results concerning actigraphy sleep measures suggest that data from at least 2 nights are to be recommended when assessing sleep percent and at least 5 nights when assessing sleep efficiency. For actigraphy-measured total sleep time, more than 7 nights are needed. At least 6 nights of measurements are required for a reliable measure of self-reported sleep. Fewer nights (days) are required if measurements include only week nights. Overall, there was a low correlation between the investigated actigraphy sleep parameters and subjective sleep quality, suggesting that the two methods of measurement capture different dimensions of sleep.

Place, publisher, year, edition, pages
2017. Vol. 13, no 1, 39-47 p.
Keyword [en]
actigraph, sleep diary, sleep quality, sleep efficiency, method, repeated measures
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:uu:diva-311891DOI: 10.5664/jcsm.6384ISI: 000394468000008PubMedID: 27707448OAI: oai:DiVA.org:uu-311891DiVA: diva2:1061740
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1758 2010-1563
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2017-04-07Bibliographically approved

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