Fig. 4

Comparison of the abundance of distinct metabolic features (DMFs) in silicosis (SIL) and healthy control (CON) groups after targeted metabolomics validation and ROC analyses. P < 0.05 indicated statistical significance. a Abundance of kynurenine. b ROC curve of kynurenine. c Abundance of l-arginine. d ROC curve of l-arginine. e Abundance of creatine. f ROC curve of creatine