Figure 2: ROC curve of serum CTRP3, CTRP9, and CTRP3 + CTRP9 for discrimination between the RA group and the healthy group. (a) Predictive value of detecting serum CTRP3 and CTRP9 separately in RA. (b) Predictive value of combined detection of serum CTRP3 and CTRP9 in RA. ROC: Receiver operator characteristic, CTRP3: Complement component 1q tumor necrosis factor-related protein 3, CTRP9: CTRP9: Complement component 1q tumor necrosis factor-related protein 9, RA: Rheumatoid arthritis