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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

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Respiratory Research

ISSN: 1465-993X

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