highly significantp < 0.001
When referring to ADD and ADHD in the forthcoming we relate to the statistically derived ADD/ADHD-clusters and not to the clinical diagnosis: For ptTBA, we found a highly significant difference between the ADD cluster (5.87 ± 0.61 μV 2 ) and the ADHD cluster (2.62 ± 0.80 μV 2 ) (t(45) = 15.91; p < 0.001; d = 4.60).