The NF1 group did not differ from other groups [ASD: t(144) = 1.13, p = 0.26, CI = −0.48 to 1.77; FH-ASD + ADHD: t(144) = 0.30, p = 0.77, CI = −1.13 to 1.53; FH-ADHD: t(144) = 0.86, p = 0.39, CI = −0.74 to 1.89) and did not show different developmental change to the other groups [ASD: t(150) = −1.68, p = 0.09, CI = −0.01 to 0; FH-ASD + ADHD t(150) = −1.08, p = 0.28, CI = −0.01 to 0; FH-ADHD t(150) = −1.47, p = 0.14, CI = −0.01 to 0]. The gene discussed is NF1; the disease is attention deficit-hyperactivity disorder.