TTR and attention deficit-hyperactivity disorder: However, no significant differences were found between ADHD and s-ADHD (all P>0.05).For protein metabolism indicators in biochemical indices, intergroup differences in total protein (TP), albumin (Alb), globulin (Glb), albumin/globulin ratio (A/G), and prealbumin (PA) were highly significant (all P < 0.05).