4.6 Article

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

Journal

SLEEP MEDICINE
Volume 15, Issue 9, Pages 1107-1114

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.sleep.2014.04.015

Keywords

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

Funding

  1. German Ministry of Education and Science (BMBF) [01ER1001A-1]

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Objective: To assess the agreement of sleep parameters measured by two actigraphs (SOMNOwatch plus (R), ActiGraph GT3X+(R)) 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 (R) (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 (R) (hip), and -81.1 min (95% CI -91.9; -70.4) for GT3X+(R) (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. (C) 2014 Elsevier B.V. All rights reserved.

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