In the multiple linear regression analysis, adjusting for age and sex, RA patients with each 10 year increment of age had a significant 1.45-fold increase (p = 0.009; 95% confidence interval (CI) = 1.11–1.91) in GNG13 expression and 1.40-fold increase (p = 0.015; 95% CI = 1.07–1.84) in NGFR expression (Table 3). Here, NGFR is linked to rheumatoid arthritis.