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. 2021 Apr 30;15:647517. doi: 10.3389/fnins.2021.647517

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Copyright © 2021 Zhang, Han, Zeng, Wang and Lv.

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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(A) Comparison of the mean indexes of grade I waves between the two groups. (B) Comparison of the mean indexes of grade III waves between the two groups. (C) Comparison of the mean indexes of grade V waves between the two groups. (D) Comparison of the mean indexes of grade I–III waves between the two groups. (E) Comparison of the mean indexes of grade III–V waves between the two groups.