HLA-DRB1 and rheumatoid arthritis: The ORs showed that Chinese patients with RA had significantly higher frequencies of HLA-DRB1*04 (Figure 2), *0401, *0404, *0405 (Figure 3) and *0410 (ORDRB1*04 =4.19, 95% CI =3.44–5.11, p<0.00001; ORDRB1*0401 =2.53, 95% CI =1.54–4.16, p=0.0003; ORDRB1*0404=2.28, 95% CI =1.28–4.06, p=0.005; ORDRB1*0405=3.71,95%CI=2.52–5.45, p<0.00001; ORDRB1*0410=2.99,95% CI=1.25–7.14, p=0.01 respectively).