When only one risk allele is present, the difference has less importance (29.7% MODY vs. 44.3% type 1 diabetes) so the presence of a single risk allele is not conclusive to differentiate between autoimmune diabetes and MODY and for this reason HLA-DRB1 genotyping has the low specificity shown before (48.1%). Here, HLA-DRB1 is linked to type 1 diabetes mellitus.