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Sleep Med. 2014 Sep;15(9):1107-14. doi: 10.1016/j.sleep.2014.04.015. Epub 2014 May 28.

Agreement of different methods for assessing sleep characteristics: a comparison of two actigraphs, wrist and hip placement, and self-report with polysomnography.

Author information

1
Institute of Clinical Epidemiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany. Electronic address: melanie.zinkhan@uk-halle.de.
2
Institute of Epidemiology and Social Medicine, Westphalian Wilhelms-University Münster, Münster, Germany.
3
Leibniz Institute for Prevention Research and Epidemiology - BIPS GmbH, Bremen, Germany.
4
Department of Internal Medicine B, Ernst-Moritz-Arndt University Greifswald, Greifswald, Germany.
5
Interdisciplinary Center of Sleep Medicine, Charité University Hospital, Berlin, Germany.
6
Department of Neurology - Sleep Medicine and Neuromuscular Disease, Westphalian Wilhelms-University Münster, Münster, Germany.
7
Department of Clinical Neurophysiology, Klinikum Bremen-Ost, Bremen, Germany; Department of Neurology, Klinik Maria Frieden, Telgte, Germany.
8
Institute of Physics, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
9
Institute of Medical Epidemiology, Biostatistics and Informatics, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
10
Institute of Clinical Epidemiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
11
Department of Psychiatry and Psychotherapy, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
12
Institute of Clinical Epidemiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany; School of Public Health, Department of Epidemiology, Boston University, Boston, MA, USA.

Abstract

OBJECTIVE:

To assess the agreement of sleep parameters measured by two actigraphs (SOMNOwatch plus, ActiGraph GT3X+) at two different placements (wrist, hip) and of self-reported sleep with polysomnography (PSG).

METHODS:

We estimated agreement with PSG for total sleep time (TST), sleep onset latency (SOL), wake after sleep onset (WASO), number of awakenings after sleep onset (NASO), and sleep efficiency (SE%) for 100 participants of the general population, aged 18-75 years by judging mean differences to PSG and intervals of agreement using Bland-Altman plots.

RESULTS:

Mean difference to PSG for TST was 8.3 min (95% confidence intervals [CI] -7.4; 24.1) for SOMNOwatch plus (wrist), 39.8 min (95% CI 24.3; 55.3) for self-report, -79.0 min (95% CI -89.0; -68.9) for SOMNOwatch plus (hip), and -81.1 min (95% CI -91.9; -70.4) for GT3X+ (hip), respectively. The width of intervals of agreement differed with the placement of the devices. Mean differences to PSG were higher for hip-based measurements compared with wrist placement for most parameters.

CONCLUSIONS:

Agreement of sleep parameters assessed by actigraphy with PSG differs with the placement of the device and is limited for hip-based measurements. Agreement of self-report with PSG is comparable to that of actigraphy for some parameters.

KEYWORDS:

Actigraphy; Agreement; GT3X+; Placement (hip, wrist); Polysomnography; SOMNOwatch; Self-report

PMID:
25018025
DOI:
10.1016/j.sleep.2014.04.015
[Indexed for MEDLINE]

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