For example, one study showed an increased frequency of the C allele at the 174 polymorphism of the IL-6 gene in children with ADHD; moreover, the A and G alleles of the 174 polymorphism have been associated with measures of attention, with people with the IL-6 AA homozygotes performing better than IL-6 homozygotes [58]. The gene discussed is IL6; the disease is attention deficit-hyperactivity disorder.