abortions and preterm birth is just that at a later time. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2613558/ … Must use e.g. MZ-DZ design, see:https://osf.io/8v4xa/
They should use more than just siblings vs. unrelateds. Siblings alone cannot adjust for all genetic confounding. Many genetic errors cause
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Twin-designs cannot be used to study effects of gestational age as twins are the result of the same pregnancy (and will have the same GA).
End of conversation
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