An excess of schizophrenia has been observed in the biological relatives of adoptees with schizophrenia. The present analysis examined the possibility that illness observed among 90 half-siblings may have been influenced by assortative mating resulting in excess illness in the biological parents of the half-siblings not biologically related to the adoptees (the coparents). We found no difference in the prevalence of mental illness between 44 index and 26 control coparents.
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References
1.
IngrahamL. J. (1995) Family-genetic research and schizotypal personality. In RaineA.LenczT.MednickS. (Eds.), Schizotypal personality. Cambridge, UK: Cambridge Univer. Press. Pp. 19–42.
2.
KendlerK. S.GruenbergA. M.KinneyD. K. (1994) Independent diagnoses of adoptees and relatives as defined by DSM-III in the Provincial and National samples of the Danish adoption study of schizophrenia. Archives of General Psychiatry, 51, 456–468.
3.
KetyS. S.RosenthalD.WenderP. H.SchulsingerF. (1968) The types of and prevalence of mental illness in the biological and adoptive families of adopted schizophrenics. In RosenthalD.KetyS. S. (Eds.), The transmission of schizophrenia. Oxford, UK: Pergamon. Pp. 345–362.
4.
KetyS. S.WenderP. H.JacobsenB.IngrahamL. J.JanssonL.FaberB.KinneyD. K. (1994) Mental illness in the biological and adoptive relatives of schizophrenic adoptees: replication of the Copenhagen study in the rest of Denmark. Archives of General Psychiatry, 51, 442–455.
