The rate of agreement or co-occurrence, as in the percentage of twins who share a particular disorder with their co-twins is the ______ rate.

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Concordance rate refers to the percentage of twins who share a particular disorder with their co-twins. Co-morbidity refers to the presence of two or more disorders in the same individual. Reactivity refers to changes in behavior or responses due to being observed or studied. Incidence refers to the number of new cases of a disorder within a specific timeframe.

The Rate of Agreement or Co-Occurrence, as in the Percentage