In a twin study concerning the genetic bases of schizophrenia, a pair of twins who both have this disorder are said to display concordance.

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Concordance refers to the presence of a particular trait or disorder in both twins of a pair, and in twin studies, it is often used to explore the role of genetic factors in the development of a given condition. Therefore, if both twins of a pair have schizophrenia, they are said to display concordance for this disorder.

In a Twin Study Concerning the Genetic Bases of Schizophrenia