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. 2021 Nov 29;58:00469580211056201. doi: 10.1177/00469580211056201

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© The Author(s) 2021

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Relationship between measured and predicted time domain variables. (A) SDNN: standard deviation of the NN interval. (B) RMSSD: square root of the mean of the sum of the square of differences between adjacent NN intervals. (C) NN50: number of interval differences of successive NN intervals greater than 50 ms. (D) pNN50: proportion derived by dividing NN50 by the total number of NN interval. Significant correlation between measured and predicted variables, ^**P < .01.