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. 2019 Nov 28;21(11):e16273. doi: 10.2196/16273

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©Shahab Haghayegh, Sepideh Khoshnevis, Michael H Smolensky, Kenneth R Diller, Richard J Castriotta. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 28.11.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Forest plot of the standardized mean difference (Hedges g) between Fitbit and polysomnography for the variable of wake after sleep onset (WASO). Results are shown as effect size (ES) and 95% CI. The difference in symbol size indicates the difference in the weight of the respective studies. The diamond symbol shows the 95% CI of the overall effect and the tails show the 95% prediction interval of the overall effect. PLMS: periodic limb movement in sleep.