Post hoc t-tests revealed no significant differences between the “MAOA gene” and the “Brain Injury” group [t(200.53) = 2.20, p = 0.074], nor between the “Absent Biomechanism” group and the “MAOA gene” group [t(201.43) = 0.86, p = 0.666]. This evidence concerns the gene MAOA and brain injury.