The authors determined the risk for psychiatric disorders in the first-
degree relatives of 36 probands with schizotypal personality disorder (13
definite, 23 probable), 17 probands with borderline personality disorder
(two definite, 15 probable), and 90 normal control probands. The relatives
of probands with schizotypal personality disorder without a concurrent
diagnosis of borderline personality disorder had a significantly greater
risk for schizotypal personality disorder than the relatives of normal
control probands, borderline probands, or schizotypal probands with
coexisting borderline personality disorder. The relatives of borderline
probands had a significantly greater risk for definite and probable
borderline personality disorder than the relatives of normal control
probands.
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