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Evidence from twin studies further supports a genetic link for OCD. These studies show a concordance rate of approximately 57% for identical twins, which is significantly higher than the 22% rate observed in fraternal twins.

Concordance Rates of OCD in Twins

A large-scale study on obsessive-compulsive disorder (OCD) found that when one identical twin has the disorder, the other twin has a 57% chance of also having it. For fraternal twins, this chance is 22%. Based on these findings, what is the most logical conclusion about the development of OCD?

A study on a specific psychological disorder found a concordance rate of 57% in identical twins and 22% in fraternal twins. Based on these findings, what is the most accurate conclusion about the development of this disorder?

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