Melanie Zinkhan1, Klaus Berger2, Sabrina Hense3, Maren Nagel2, Anne Obst4, Beate Koch4, Thomas Penzel5, Ingo Fietze5, Wolfgang Ahrens3, Peter Young6, Svenja Happe7, Jan W Kantelhardt8, Alexander Kluttig9, Andrea Schmidt-Pokrzywniak10, Frank Pillmann11, Andreas Stang12. 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.
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.
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