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. 2018 Sep 7;8:13474. doi: 10.1038/s41598-018-31748-0

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Comparison of sleep quality parameters between SSA and PSG. Data was taken from the validation dataset (n = 100), each point represents a subject. (A) TST – Total sleep time (minutes); (B) WASO – Wake after sleep onset (minutes); (C) SL – Sleep latency (minutes); (D) SE – Sleep efficiency (percentage of total sleep time); (E) RP – Rapid-eye-movement sleep (percentage of total sleep time); (F) NP – Non-rapid eye movement sleep (percentage of total sleep time); (G) RL – rapid eye movement latency (minutes); (H) RC – number (#) of rapid eye movement cycles, presented as confusion matrix. Solid line – line of identity between polysomnography (PSG) and sleep sound analysis (SSA); dashed lines – 95% confidence interval; r – concordance correlation coefficient.