Fig. 1

a Serum lipid species in patients with polymyositis or dermatomyositis compared to healthy individuals. PC, phosphatidylcholine; TG, triacylglycerol. Results are expressed as percentage area (area %) (mean ± SE): *p < 0.05, **p < 0.01, for patients with polymyositis (PM)/dermatomyositis (DM) versus healthy individuals. b, c Score plots from unsupervised clustering by principal component analysis (PCA) (b) and supervised clustering by orthogonal projection to latent structures (OPLS) (c) are shown. Healthy individuals are represented by blue squares and patients with PM/DM by red triangles. d The corresponding loading plot obtained from OPLS analysis. Lipids important for the separation of patients with PM/DM from controls are highlighted in red