HLA-DRB1 and type 1 diabetes mellitus: The HLA-DRB1*03/DRB1*04 genotype presented the highest risk (OR 12.1, CI 9.64–15.20, p < 0.0001) in 23.6% of the T1D participants, followed by DRB1*03/DRB1*03 (OR 10.6, CI 7.54–14.92, p < 0.0001) in 9.8% and DRB1*03/DRB1*09 (9.01, CI 4.85–16.71, p < 0.0001) in 2.7%.