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. 2017 Feb 17;19(2):e40. doi: 10.2196/jmir.6330

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©Trevor van Mierlo, Xinlong Li, Douglas Hyatt, Andrew T Ching. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 17.02.2017.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), 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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Table 7.

R² values for ten models.

Model	1	2	3	4	5	6	7	8	9	10
R²	0.016	0.013	0.02	0.043	0.026	0.027	0.018	0.061	0.086	0.031