Figure 2B). Combining in a model RA classification score, age, gender, blood levels of insulin, and IFNg refined the AUC to 0.762 (95%CI 0.693–0.832), p < 0.0001. Figure 2B. The parameters of the final model were quantified for multicollinearity and showed the values of variance inflation factor was close to 1, indicating the lack of collinearity between the parameters of this model (Figure 2C). Here, IFNG is linked to rheumatoid arthritis.