HLA-DRB1 and rheumatoid arthritis: Protective properties that reduce the risk of RA were found for alleles HLA-DRB1: *07 (OR = 0.6 [CI: 0.4–0.9], p = 0.02), *08 (OR = N/A, p = 0.0076), and *13 (OR = 0.5 [CI: 0.3–0.89], p = 0.01).