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. 2022 Jun 27;8:86. doi: 10.1186/s40798-022-00477-0

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© The Author(s) 2022

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — Forest plot describing the validity of step frequency measured using IMU (Pearson correlation coefficient, r). Squares represent Fisher’s Z; bars indicate 95% confidence intervals and diamonds as pooled data. De Fontenay et al.,2020a (IMUs vs optical motion capture system, IMUs: Moov Now™), 2020b (IMUs vs optical motion capture system, IMUs: MilestonePod), 2020c (IMUs vs optical motion capture system, IMUs: RunScribe™), 2020d (IMUs vs optical motion capture system, IMUs: Zoi), 2020e (IMUs vs optical motion capture system, IMUs: TgForce) [38]; García-Pinillos et al.,2019a (IMUs vs optical motion capture system, IMUs: Stryd™), 2019b (IMUs vs optical motion capture system, IMUs: RunScribe™) [42]. SE standard error, IV inverse variance, CI confidence interval