Fig. 3

The validation and correlation analysis of the four selected proteins. A Comparison of serum levels of the four selected proteins between each SSc subgroup and the HCs using ELISA tests. B, C Correlation analysis of the clinical features/laboratory results/examination results and serum protein levels performed by the Pearson correlation analysis (B) and the point biserial correlation test (C). * indicated p-value < 0.05, ** indicated p-value < 0.01