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. 2020 Nov 6;11:603899. doi: 10.3389/fphar.2020.603899

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Copyright © 2020 Wang, Sun, Liu, Du, Liu, Yang, Xue and Zhao

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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Multivariate statistical analysis of two groups. The principal component analysis (PCA) plot of QC and samples in (A) positive ion mode and (B) negative ion mode in the training set. The orthogonal partial least square discrimination analysis (OPLS-DA) score plots of OLP group vs. healthy control group in (C) positive ion mode and (D) negative ion mode in the training set. Cross-validation plot with a permutation test repeated 200 times of OLP group vs. healthy group in (E) positive ion mode and (F) negative ion mode in the training set. A, OLP group; H, healthy control; QC, quality control.