PRRT2 and attention deficit-hyperactivity disorder: Comparing PKD patients with ADHD to those without, there were no significant differences in trigger causes (p=0.212), duration of attacks (p=0.475), frequency of attacks (p=0.565), PRRT2 variants (p=0.611), family history of paroxysmal dyskinesia (p=0.541), history of afebrile infantile seizure (p=0.342), age of onset (p=0.244), FSIQ score (0.654), VIQ score (0.749), and PIQ score (0.584).