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. 2019 Sep 25;19(19):4160. doi: 10.3390/s19194160

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Bland–Altman plots show the PSG gold standard with (A) MB, (B) MW, and (C) SC in measuring sleep efficiency (SE). The blue horizontal line represents the mean difference between the two measurements, and the shaded blue area represents the 95% CI of the mean difference. Black horizontal lines mark the 1.96 SD from the mean. The black dashed line is the line of equality (difference = 0), and the red dashed line represents the Spearman correlation between the difference and the average of the two measurements. SE: Sleep Efficiency, MB: Mi Band, MW: MotionWatch, and SC: Sleep Cycle.