In twin studies the key comparison involves determining how many pairs of twins either have the same disorder or are free of the disorder; this involves the calculation of

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Concordance rates are used in twin studies to determine the level of similarity between twins in terms of a particular trait or disorder. In the case of twin studies focusing on disorders, the key comparison is often between twins who have the disorder (concordant pairs) and those who do not (discordant pairs), which allows researchers to distinguish between genetic and environmental contributions to the disorder.

In Twin Studies the Key Comparison Involves Determining How Many