The statistical analysis demonstrated a positive correlation between HERV-H relative expression and all the scores values (Figure 2, panel B): in particular CP-O (rho 0.543, p = 0.013), CP-I (rho 0.648, p = 0.002), CP-H (0.676, p = 0.001) and CP-AI (rho 0.751, p < 0.001), in ADHD patients before and during treatment. Here, CPO is linked to attention deficit-hyperactivity disorder.