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. 2019 Mar 27;8(3):e12808. doi: 10.2196/12808

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©Milla Jauhiainen, Juha Puustinen, Saeed Mehrang, Jari Ruokolainen, Anu Holm, Antti Vehkaoja, Hannu Nieminen. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 27.03.2019.

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

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The orientation of the smartphone when worn on the waist. The X-axis measures vertical movement, the Y-axis measures horizontal movement in the lateral direction, and the Z-axis measures movement in the posterior-anterior direction. The phone is worn in a bag on the waist and inserted correctly on the stomach side with the screen out and the right side up.