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Gottesman and shields

Gottesman and Shields (1966) carried out a study into whether schizophrenia might be caused
genetically. They compared MZ and DZ twins to see how often when one twin had been diagnosed
with schizophrenia the other had a similar diagnosis.


Previous twin studies had shown a difference…

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Category 1 ­ both twins had been diagnosed with schizophrenia

Category 2 ­ One twin had schizophrenia, the other twin had been given another diagnosis related
to schizophrenia

Category 3 ­ the co-twin had some psychiatric abnormality, but nothing related to schizophrenia

Category 4 ­ Pairs with normal limits…

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