In a Chinese Han population, here's a study that shows that ADHD is associated with ABO types A and O. This makes sense with temperament because the higher the temperament, the higher the activity level and perhaps the attention deficit level, and temperament order high to low is O, A, B, AB. (The genetic and physiologic basis of this could be the association of ABO blood group with dopamine beta hydroxylase gene activity. This gene determines the ratio of dopamine to norepinephrine. It makes sense that dopamine level associates with ability to pay attention and to be of low activity level compared to high norepinephine (the fight or flight chemical)
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