Here is a study from a Sanguine habitancy showing that ABO O is asssociated with allergic rhinitis, an endophenotype for SZ.
In an N habitancy, SZ would theoretically be associated with N- types and have genomes that tend to affect dopamine neurotransmission differently from other people. It appears that those with SZ have increased dopamine in the lower brain centers and decreased in the higher brain centers.
The link of SZ with allergic rhinitis may have to do with disruption of autonomic nervous system.
The link of ABO phenotype with SZ may rest on the ABO linkage with dopamine beta hydroxylase where ABO A seems more likely to have high norepinephrine: dopamine ratio. This means that ABO O and B are more likely to have low norepinephrine: dopamine ratio.
What I have noticed in the office patients with ABO is that ABO A has a more unworried air compared with ABO O and ABO B or ABO AB. So the worriers are ABO O and ABO B and ABO AB. In NPA system, this corresponds with how anxiety is found more with A- and with P trait. (Depression seems more linked with N type).
All a puzzle that is slowly being put together to make a recognizable picture.
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