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. 2021 Feb 16;23(2):e20177. doi: 10.2196/20177

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©Jeongsim Kim, EunJi Shin, KyungHwa Han, Soowon Park, Jung Hae Youn, Guixiang Jin, Jun-Young Lee. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 16.02.2021.

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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Box and scatter plots of cognitive function changes in metamemory training and control groups during the 8 weeks of the study. (A) Delayed free recall (P<.001; t=0.50; Cohen d=0.84). (B) Digit span forward (P=.01; t=2.71; Cohen d=0.50). (C) Digit span backward (P<.001; t=4.52; Cohen d=0.84). (D) Fluency (P<.001; t=4.58; Cohen d=0.85).