HLA-DQA1 and type 1 diabetes mellitus: A comparison of stratified versus unstratified ORs is shown in Figure 5, for both DR3/3 and another diplotype (HLA-DR3/4-DQB1*03:02), which is more frequent in T1D (38% of the T1D population with European ancestry [8]) and contains the high-risk trans-encoded HLA-DQA*05:01/HLA-DQB*03:02 noted above.