The serum level of ADA was insignificantly different between the control (3.26+ 0.50 U/l), ADHD (2.95 ± 0.55 U/l), epilepsy (3.39 ± 0.40 U/l), and ADHD with epilepsy (2.68 ± 0.23 U/l) groups (Figure 2(c)). Here, ADA is linked to attention deficit-hyperactivity disorder.