NPA personality theory
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Re: schizophrenia and intelligence
One wonders how any make it to viability. This can be explained perhaps partially by maternal immune activity. For example, ABO type O mothers are equipped to attack fetuses of ABO A especially and less likely ABO B. So some antigen on the fetus may make it an especial target to get taken out and perhaps especially if the fetus is one of the vulnerable types from the NPA genetics ( having a deficit of one and highly vulnerable other of the NA genes) while some mothers with less tendency to form antibodies against the fetus may carry to viability an otherwise very vulnerable fetus.
For whatever reason we do know that some highly unusual fetuses(anencephaly as one example) survive to viability while others miscarry extremely early