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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 sleep efficiency (SE). Results are shown as effect size (ES) and 95% CI. The difference in symbol size indicates the difference in 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.