From: Diagnostic performance and predictive value of rheumatoid factor, anti-cyclic-citrullinated peptide antibodies and HLA-DRB1 locus genes in rheumatoid arthritis
OR (95%CI)
P value
RF present
2.5 (1.1–5.9)
0.01
CRP > 18
2.0 (0.2–5.3)
HLA-DRB1*01
4.5 (0.4–7.8)
0.002
HLA-DRB1*04
5.5 (0.4–8.7)
0.003