Focusing on each ADHD subtype, the presence of ODCD did not seem to significantly change IL-6 concentrations, probably due to the large data dispersion (39.01 ± 91.24 vs. 30.84 ± 29.45 in ADHD-AD without and with ODCD, respectively; 19.51 ± 28.67 vs. 9.55 ± 17.69 in ADHD-C without and with ODCD, respectively) (see Figure 2B). This evidence concerns the gene IL6 and attention deficit-hyperactivity disorder.