Research indicated that individuals diagnosed with ADHD showed notably elevated levels of CD3+ CD4+ CD25+ Foxp3+ (Tregs) in contrast to healthy individuals (8.23 ± 2.09 vs. 6.61 ± 2.89; z = 2.965, p = 0.004) (13). This evidence concerns the gene FOXP3 and attention deficit-hyperactivity disorder.