HLA-DRB1 and rheumatoid arthritis: Similarly, RA associated HLA-DRB1 alleles that were significantly more observed in the French than in the Tunisian samples were, by order of Odds Ratios, HLA-DRB1∗16 (OR = 0.09), HLA-DRB1∗04:01 (OR = 0.26), HLA-DRB1∗01 (OR = 0.31), HLA-DRB1∗04:04 (OR = 0.32), and HLA-DRB1∗15 (OR = 0.45).