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. 2022 Sep 9;5:138. doi: 10.1038/s41746-022-00674-x

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Distributions of PIGD scores for study visits. Both distributions favored lower PIGD scores; distribution for Study 1 is skewed less than for Study 2. b Position of an APDM Opal inertial sensor attached to the lumbar region using a stretchable belt. The sensor was placed on the lower back of the subject. Accelerometer, gyroscope, and magnetometer data were collected as subjects walked back and forth for 2 min (as part of the UPDRS Part III test) while wearing this sensor.