I had another thought/question about the odds ratios for the ERAP1 SNPs. The relative risks listed for Rs30187(C;T) and Rs27044(C;G) are 1.5x and 1.4x. If those are the odds ratios for the general population, but the increased risk is only associated with HLA-B27+ people (~8% of the population), then wouldn't the relative risk of those SNPs in an HLA-B27+ person be much higher?