For the ADHD probability index, which indicates whether the individual is similar to an individual with ADHD, most (n = 16/19; 84%) of the SYNGAP1-ID group were found to have a ADHD probability Index of greater than 50%, whilst for the typically developing controls only two individuals out of 17 were found to have a score above this percentage. The gene discussed is SYNGAP1; the disease is attention deficit-hyperactivity disorder.