Association of HLA-DR-DQ halotypes with RA stratified by DQ.

*PRA: rheumatoid arthritis; OR (95% CI): odds ratio (95% confidence interval).†DQ2:DQA1*0201/03/0501-DQB1*0201; DQ3: DQA1*03-DQB1*0301/02/03; DQ4: DQA1*03 -DQB1* 0401; DQ5: DQA1*0101/04-DQB1*0501; DQ6: DQA1*0102/03-DQB1*0601;