MAOA and brain injury: Post hoc t-tests revealed no significant differences between the “Absent Biomechanism” group and the “Brain Injury” group [t(215.00) = 2.26, p = 0.063], nor between the “Brain Injury” group and the “MAOA gene” group [t(209.01) = 1.83, p = 0.163], or the “MAOA gene” group and the “Absent Biomechanism” group [t(202.05) = 0.39, p = 0.918] (Figure 5).