Correlations between the RA disease activity index and SF-36® and DAS28-CRP correlated with RF (r = − 0.426), RP (r = − 0.566), BP (r = − 0.366), SF (r = − 0.401), RE (r = − 0.458), and MH (r = − 0.413). This evidence concerns the gene CRP and rheumatoid arthritis.