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. 2018 May 30;6(5):e127. doi: 10.2196/mhealth.8409

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©Till-Ansgar Neubert, Martin Dusch, Matthias Karst, Florian Beissner. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 30.05.2018.

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 JMIR mhealth and uhealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Bland-Altman plot of symptom extent. The central bold lines represent the mean difference. The dotted lines represent the 95% upper and lower limits of agreement. The mean symptom extent of the first and second symptom drawing (D1 and D2) is plotted against the difference in symptom extent between D1 and D2.