The allele frequency represents the incidence of a gene variant in a population. Alleles are variant forms of a gene that are located at the same position, or genetic locus, on a chromosome.

The HLA-DRB1*01:03 allele explained this association overall (OR 3.32, 95% CI 2.25-4.89, P=1.45 × 10-9) and in the two ...