CXCL8 and attention deficit-hyperactivity disorder: The post hoc analysis revealed that the ASD males were characterized by significantly higher levels of IL-2 and IL-8 and significantly lower levels of TNF-α and Th1/Th2+Treg ratio compared to the ADHD males (p = 0.002; p = 0.048; p = 0.005; p = 0.032; respectively).