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. 2022 Feb 28;13:812996. doi: 10.3389/fimmu.2022.812996

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Copyright © 2022 Wang, Yang, Shang, Liang, Wang, Feng, Yu, Li, Gao, Li and Luo

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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OPLS-DA score scatter plots of polar extracts between HC group and PsA group in positive (A) and negative ion mode (B). The result of permutation test in positive ion mode (C) and negative ion mode (D). The R² and Q² values were R²X (cum) = 0.317, R²Y (cum) = 0.968, Q² (cum) = 0.918 in positive mode. The R² and Q² values were R²X (cum) = 0.362, R²Y (cum) = 0.997, Q² (cum) = 0.748 in negative mode. The intercept of Q² of positive and negative ion modes on the y-axis was <0, indicating a valid model.