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Table 2 Characteristics of the OPLS-DA models for the pilot and validation study sets analyzed in positive (ESI+) and negative (ESI-) ESI mode

From: Serum metabolic profiling identified a distinct metabolic signature in patients with idiopathic pulmonary fibrosis – a potential biomarker role for LysoPC

Study Ionisation Number of samples R2(cum) Q2(cum) CV ANOVA p-value Permutation test
Pilot ESI+ 20 0.894 0.599 0.0058 R2 = 0.734
Q2 = −0.209
Validation ESI+ 21 0.903 0.742 0.00014 R2 = 0.694
Q2 = −0.318
Pilot ESI- 19 0.872 0.503 0.0339 R2 = 0.767
Q2 = −0.299
Validation ESI- 21 0.878 0.721 0.0003 R2 = 0.66
Q2 = −0.447