HLA-DRB1 allele carrier frequency in RA patients and controls.

RA: rheumatoid arthritis, OR: odds ratio, CI: confidence interval, Pc: corrected P value, NS: not significant, RPE: relative predispositional effects. Allele carrier frequencies are shown in parenthesis (%). Association was tested by Fisher's exact test using 2×2 contingency tables. RPE were tested by sequential elimination of carriers of each of the alleles DRB1*04:05, *13:02, *04:01, *09:01, *01:01, *14:06, *10:01, *04:10, and *11:01. Allele groups SE, D70, I67, and S1 were as defined in the Materials and Methods section. DRB1 alleles encoding the DERAA were the same as DRB1*13 (i.e. *13:01 and *13:02).