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. 2021 Feb 17;10:597422. doi: 10.3389/fonc.2020.597422

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Copyright © 2021 Pan, Wang, Wang, Nikzad, Kong, Jian, Zhang, Lu, Xu, Wang and Chen

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Sensitivity analysis of studies. Goodness of fit refers to the fitting degree of the regression line to the observed value. The statistic to measure goodness of fit is R². The maximum value of R² is 1. The closer the value of R² is to 1, the better the fitting degree of the regression line to the observed value is; on the contrary, the smaller the value of R² is, the worse the fitting degree of the regression line to the observed value is.