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. 2019 Nov 27;7:61. doi: 10.1186/s40635-019-0276-8

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 3 — a, b: Relationship between our unadjusted surrogate of mechanical power (Eq. 3) and the reference formula (Eq. 1) in pigs: panel a shows the linear regression (R² = 0.98), and panel b shows the Bland-Altman (bias = − 2.45 J/min; proportional error = − 0.09 J/min). c, d Relationship between our adjusted surrogate of mechanical power (Eq. 9) and the reference formula (Eq. 1) in pigs: panel c shows the linear regression (R² = 0.99), and panel d shows the Bland-Altman (bias = 0.21 J/min; proportional error = 0.01 J/min)