Fig. 5

The metabolomics-based discovery of PVV and PVL discriminating markers, followed by a model evaluation that is generated using the selected markers. (a) Orthogonal partial least squares-discriminant analysis (OPLS-DA) between PVV and PVL; and (b) the VIP scores of component 1 (T-score) of the OPLS-DA model. (c) Volcano plot with PVL over PVV. Lysophospholipids and hydroxy fatty acids (HFAs) are highlighted. (d) Difference in the expression of lysophospholipids. (e) Difference in the expression of HFAs. (f) Confusion matrix of machine learning-based discrimination using six lysophospholipids and four HFAs that were selected based on their VIP score and (g) receiver operating characteristic (ROC) curve discriminating PVL over PVV, with an area under the curve (AUC) value.